The first few times, if it's good stuff, feels great, but it has to be good stuff which is hard to find. Then you end up doing it more and more and the rush and high are good but each time you need more dope or it wears off, and you don't feel it. Then when you don't get it, which will happen because you either won't find it or spend all your money, you get VERY sick. And every time you have it on you your at a HUGE risk of being locked up for a long time.
I'm the end, the 20 seconds of rush and few hours of high are not worth it. You'll end up broke, alone, hanging with dangerous people or theives and other addicts, you'll start doing illegal ****, you'll likely end up doing time, and it will ruin your life. Few people who do it can stop. Yeah you can try it once and then never do it again, but don't you think that's what everyone says? It's so good at first it pulls you in and then your screwed.
If you are rich, or have a super high income, then you can probably handle it, and you need a good safe source, both of those things are rare, most people will end up suffering badly so your best bet is to stay away
If you gotta get f'ed up, I'd smoke pot, drink, and maybe mess around with random **** here and there, but stay away from opiates or anything that can develop into a life ruining habit
Just think, all the junkies out there started just like you, a little curious, the I will do it once attitude and the I won't end up like that attitude etc...
Just save yourself the trouble, it's feels good but not THAT good. Sex, roller coasters, sky diving, etc... All feel good too.