This is why all us heroin addicts tell people never to try it once. That mental state of wanting heroin will be there a long time even after one try that's just how good it feels. I remember my first opiate I felt like superman like I could do anything I wanted but also calm content and happy with where I was at that exact moment. I knew right away I was in for a world of shit and I was right almost 10 years later im still chasing this high to the gates of insanity, Suboxone saved me for now but it only covers up the sickness that lies within me a sickness I will carry around with me till the day I die because In my opinion once an addict always an addict is a true saying.
What I recommend while its not too late for you, is trying to find things in life that excite you besides drugs (especially heroin) once you've done it a few times in a row 9 times out of 10 your gonna become addicted and once the physical part comes not just the mental then you are screwed cause the physical withdrawal from heroin is brutal , unrelenting, and unimaginably cruel those are the only words I can think of to describe opiate withdrawal specifically heroin.
Please try to find a girlfriend/boyfriend whatever your into and start doing fun things you enjoy without drugs. Do you have any dreams or hope for the future? I'm sure you must have something you want to do in life besides heroin cause heroin won't lead you anywhere besides the worst lifestyle a person could possibly lead with no dreams for the future, a damaged body, lonely, miserable, and most of all no zest for life. Don't throw your life away stay away from heroin it turns you into a complete loser nobody wants to be around I've seen so many good hard working people who have lots of self control fall victim to heroin, its like a god dam plague the way it spreads from person to person slowly taking them out from the inside out.
I've sufferd a lot of hurt from heroin my friend I've fucked up my kidneys, given myself blood poisoning, my liver is almost shot in my early 20s, all my medical problems are exacerbated more than ever , every relationship I've had has been destroyed , I'm miserable, I'm alone, I'm in pain and its made me a harder person I would say not for the better either. I spend my life knowing I'll always be a lowlife heroin junkie knowing no matter how far I run I can never escape this demon so I stay right where I am and wait hoping I just make it through another day heroin free.