I'm most likely the only one on here who has done meth, so I'm going to be honest with you. Everyone else on here will just post obvious worst case scenarios, which are of course true, but that doesn't necessarily mean doing it once is going to ruin your life. First off, someone CAN do meth without becoming addicted. I'm a prime example of that. I've done it hundreds of times before and I haven't ever formed a full addiction to it. Of course it does make you feel good. It's the only upper that I even like. It doesn't speed you up as much as people think though and actually has a relaxing feel to it. You'll even think you can fall asleep until you try to. I'd recommend smoking it or you can also snort it if you want. I don't do it much anymore, but it's fun every once in a while to get a gram or 2 and just binge with friends for a few days. Meth is unique in that you kind of do get hooked instantly. As long as you have it, you will continue doing it until you're out. Just don't buy large amounts at a time. Once you run out and the comedown is over, then the cravings go away.
And for long term side effects, there are a lot. I know 3 women in particular who have been doing it for 35+ years and they are in bad condition. They look like they're 80 years old, have no teeth, and I can barely understand anything they say. If you're looking for this to be a long term thing for you, then I would definitely say not to go with meth. It really does some nasty shit to your body. I mean not sleeping and eating is bad enough. Time goes by really fast when you're speeding and you can easily go several days without thinking about food, sleep or even hygiene. If you've ever gone a while without any sleep, then you know that your body starts behaving strangely after about 3 days. You actually start to trip. You'll begin having mild open-eye visuals and won't be able to think right. It's even hard to speak properly and say a full sentence without skipping words. It's not as noticeable when speeding, but that doesn't make it any less unhealthy.
Your best bet is to just not touch it at all. There are way too many risks and it just isn't worth it. There is always a chance that you'll like it too much and could turn into a daily thing for you. I can tell you that a drug addiction is not a road you want to go down. All people react to drugs differently. Like with me, I like speed a lot, but not nearly enough to turn it into a habit. I can't say much about you because I don't know you. If you really do want to try it, then just be careful and don't let it get out of hand if you decide you really like it.
Let me know if you have any other questions about it.