I highly suggest you stop now while you still can. I began using opioids very young (15, but only codeine). I didn't start heroin until I was about 18 and at first I snorted it. The first two weeks I used it I would use it every 3 days or so. However, by the third week it quickly began to spin out of control. I began using it almost daily. I kept telling myself this is "just for now", so I kept using it. I snorted heroin for almost 2 years but I got to a place where it was becoming really expensive snorting it and I just couldn't fit so much powder in my nose anymore (my tolerance after nearly two years of frequent use was obviously high). So just before my 21st birthday I began to shoot heroin. After that everything went downhill. On top of the heroin I was using various prescription opioids, especially morphine and hydrocodone. I was also using massive amounts of benzodiazepines of all kinds - I wasn't picky at the time I just did whatever benzo came my way. I was using cocaine, alcohol, Adderall, Fioricets, Dexedrine, MDMA (at the time I was both using it and selling it to help support my heroin habit) and just about everything under the sun - anything to alter my state of mind. I was super addicted to everything, but my DOC was heroin. I managed to get through a 4 year medical laboratory science program (I don't even know how, but I did it). After that though I didn't even pay my student loan back, didn't look for a job in my field and continued on with heavy drug use. I even ended up on the streets homeless after I had broken all bridges with family and aunts/uncles, etc. I literally used to walk the streets day and night doing the same thing everyday - in the morning I'm trying to pull scams or steal or do anything to get some cash, when that is done I go to the dealer and buy dope, shoot up and go out in search of more money. The cycle didn't end. I did that for almost a year until I called my aunt one night balling my eyes out because I was so strung out, hungry and scared. She took me in. I used to get the shit beat out of me regularly because I was a little smaller blond white boy on the streets of one of the blackest cities in all of America so people robbed me, mugged me, just all kinds of shit I went through.
To make a long story short, chasing that heroin high brought nothing but misery to me. I'm now 28 and on methadone. I don't really use street drugs anymore (I cheat sometimes with crystal and by buying unscripted benzos or order them online) but that's it. I am scripted Xanax and Dexedrine along with fentanyl patch. Doing much better than I was just even 2 years ago.
I also began doing what I love. I studied toxicology a lot while doing the med lab science program and I was very interested in venomous reptiles. So I do that now. I write articles for an encyclopedia (not wikipedia) that is only open to those with a bachelors degree and above. So I write articles on all kinds of different species of snakes, snake venom and its composition, lethality, molecular weight, etc. I also collect venomous snakes. So this is a hobby for me. I love it and it makes me happy. So find what you love in life and start focusing more on that.