I didn't read a lot of the responses I'm here because I thought they were pretty sarcastic or they were giving oh, I wouldn't say bad but definitely esoteric advice. Well here goes mine, you can take it or leave it I'm kind of direct sort of person so I'm good to ask about things that you wouldn't normally ask cuz I don't give a f*** and I lived it and conquered it and therefore should attempt to spread my knowledge as well as I can.
First of all, we've all been there; any one who says otherwise is a list and/or a eunuch and their opinions should be thrown out as it is simply trolling. I've been tweeking for the past three years, consecutively, in four different scenee in three different states. And in all aspects, I've dealt, I've consumed (all possible administration routes, i.e. slamming, smoking, booty bumping, snorting, parachuting, and even though the root eyeball), I middle managed, I even managed dealers , I was also a mule and for a short time even a self-employed prostitute/house boy-bag hoe... all for that bitch Tina, but I digress; my point is I talked to a plethora of people suffering a similar affliction and from all of their advice in conjunction with my own experiences perhaps I could give you a few simple steps that will really help you cum at last, because let me tell you it may seem impossible but it isn't and when it happens... Hold on to your fucking hat because you'll never want to cum any other way than that.
So if I were you I'd;
1.) As corny and kind of square as this sounds, you may need to schedule yourself a slot of time were you turn off your phone (unless if used for porn viewing, then put it on "do not disturb" & airplane mode) and set up a comfortable area; dark, soft, well secured, ect, and as odd as it may sound, but go on a date/ booty call with yourself or it you're into it, literally go fuck yourself

(I'm being totally serious, I promise, I would happily divulge more on that and the mental aspects of masterbation if asked)
2.) Getting hard in general: naturally you need to find what turns you on and I do mean naturally, I've never recommend Viagra or Cialis for those who are just beginning to do this as that's a quick way to have a heart attack if one doesn't have a strong enough heart which is an obvious risk factor, but lesser-known is combination of Viagra, methamphetamine, and say poppers could trigger full on heart attack or evening seizure, and even at low doses it can even compare the mind to the point were you able to do anything anyone suggests and say anything that was on your mind, add weed to that cocktail and you just MK ultra-ed yourself and if you are surrounded the morally depraved (as more than likely you are as this is the meth world) you might find yourself and it's very strange positions you didn't quite agree to.... Anyway, and alternative 2 those things if needed I would suggest rhino pills but I would try everything I could first not to use anything at all if possible.the mind is a powerful thing, try looking at genre of porn you would never look at before maybe that's her thing and you'll be squirting in no time. Also most people that I've spoken with suffered from Tina dick from anywhere between three months to a year which is absolute torture if you're trying to get into the whole p&p scene, my only advice for that is mental practice believe it or not it is all mental my chemical in that regard. If you ever see the movie kill Bill 2 she is paralyzed with arthropathy associated with recently being in a coma, she focused on her big toe until it wiggled, well this is the same idea just a different kind of big toe.
2.) Lubricants. Okay I'll take all your KY, your gun while, you're wet, you're Tom of Finland bulshit with blue and throw it away. While you're at it get rid of that jergens, oil of Olay, and bath & body works lotions that you have as your masturbatory b team; go to the Dollar tree Walmart I pick yourself up a tub of coconut. It does not to be virgin or Tahitian or whatever, honestly the cheaper the better, I swear up and down that it is hands-down the best lubricant the human body can use. And I used to work at a sex store as well and have tried all the expensive ones, what they actually do to your penis is the break down your nerves so you need to use more lube to cum there for you by more product come in the ones that are water-based make your hands feel like you just stuck your hands in some car wax and generally an unappealing and unattractive texture. Sexpenses, because capitalism it's a giant cock. a lot of people on are you against me and sitting petroleum jelly is the best for overcoming a lack of cumming and I don't disagree with that sentiment I feel like it depends on the person personally I use both sometimes, if you could find the liquidity petroleum jelly that one's okay too
3.) Okay stroking here we go, patience is key it's annoying is that sounds. This ain't a race; you're not trying to make butter, nor a roaring campfire, or cotton candy you're trying to ejaculate. Be nice to your dick, seriously slow massages front to back. Remember step one, you're on a date with yourself you might need to do a little foreplay first.
4.) Keep it up. Also don't surprised if this takes more than a a few sessions, if you're still not able to achieve then you might need to consider sleeping first and foremost, and drinking water two things that really are neglected while tweeking are pretty essential up to the ejaculatory processes in a sober placebo state of being and even more so necessary when high on meth as you are depleted of water and sleep so your chemistry will already be a little f*****
5.) Okay if all this doesn't work come on you're going on to double digits in hours oh, you're going to need outside help, sometimes it is easier done than said but also sometimes it's easier said than done. My advice, doublelist Grindr or tinder, and just be blunt but what you need done and open-minded and you might be surprised at who responds. Which might be bad and useless advice and to be taken with a grain of salt or two; in fact this is a meth induced rant that I never typically do, but hey there you go!