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It could be any number of things that are too many to talk about. I had back problems when I was your age caused by riding (I hadn't started flatland when I was 20 though).

I'd say your problem probably has something to with the misalignment of your pelvis. In my experience and my dealings with other riders who've had back problems this is something that comes up. If your pelvis is misaligned it's easy to correct but you have to work at it.

Basically stretching your legs - hamstrings, calves and quads will take the pressure off of your back.

Strengthening your stomach will help to support your back too and balance things out.

^^^
That's all guess work. You need to go to the doctor and get referred to a physio. The physio will tell what to do and then your back won't hurt anymore.

If you don't want to do that try tightening your stomach muscles.

Flatland isn't too bad for your back as long as you don't only do the same trick over and over again.

Yeah - but that's a short amount of time within the big picture. If all of the tricks that you learn are the same/similar then they'll be a problem I think.

Of course you have to repeat tricks to learn them but it's best for your body to have a few things you're working on and set small goals that you think can be achieved in 30mins. After that move on to another position. Changing wheels is pretty good for variety on the body. Combine that with some stuff that's pretty dialled that you enjoy and you're got yourself a decent ride that isn't going to hurt you. I didn't realise this until I started learning tricks that are dangerous or need a lot of strength/effort to balance.

If all your tricks are similar or the same then you're more likely to get strains/muscle pains/aches etc. I mean if you only do steamroller stuff, for example, you're always going to be in that same position aren't you. It doesn't matter how many variations you find to keep you entertained - you're bound to get some kind of injury from it if you do it enough.

Paul