I am 18 and I don't know what to do with my life

I am 18, male. I am from Ukraine and sorry for my bad English, I am trying my best, I swear. I've always had problems with my life but now I think I reached my apogei. It was summer and I had to choose my major in the university. I couldn't have a gap year because there is a high chance that the military registration and enlistment office will come for me(anyway, that's not the point of my problems). I didn't know what to choose, I am stupid and there wasn't much time to apply and think about it. So I chose IT major. Literally without much thinking. And now I feel so useless because I don't think its for me. I am scared that I won't be able to cope with my studies the next 4 years and won't find the work that click with me. I also can't change the major because I study on a budget and next time it will be on a paid basis, and my family doesn’t have much money. I know there are a lot of people that work on completely different job after getting a major but I don't think I will find that job either. I am an idiot who doesn't even write on English good enough. I already started to sleep really badly because of my nerves. Sorry if the post became whining about my life I tried my best to write it more restrained. Anyway, thanks for reading it, I appreciate it. I would like to hear some tips, advises or maybe similar stories to mine...