Hi! I'm also thirteen, and I used to have glasses but they proved to be really uncomfortable. You should get contacts. if you get night contacts like I did, there are mostly pros:
-You wear them at night, before you go to sleep, therefore you won't feel them, because you're sleeping(obviously)
-You take them off in the morning, but you will still be able to see clearly because the contacts shape your pupil or something, making light bend and focus properly... I don't know! (I know, so scientific). This is great because you can then see perfectly clearly without anything in front of or on your eye(s). I know how annoying glasses are. Sliding off your nose. Hitting them will hurt if the frame digs into your skin though that rarely happens, and for some people, the things that go on the top of their nose will tickle.
-Usually when you buy them they come with around two or three replacements per eye
-wearing contacts actually improve your vision. My left eye was 300 and my right eye was 250, but now my left is 150 and my right is 125
-They are not easy to lose as long as you put them in their contact case, but I mean, where else would you put them? Your cupboard? The sink? So again, highly unlikely to lose.
Cons:
-night contacts are hard, but they are made to fit your eyes so you don't feel anything within like two days, mostly because you have to get used to it, but it's not uncomfortable or painful. You could get day contacts because they are soft however it will take a lot longer to improve your vision. However, since you wear them during the day, dust could get under and it would be quite irritating. Night contacts on the other hand are actually quite comfortable.
-You do have to buy contact solution instead of just soaking them in water however contacts are better for your vision so I think it's worth it
-hmm as long as you don't roughly handle them, pinch them, throw them around, squeeze them, they shouldn't break but that goes without saying, why would you do that in the first place..?
-yeah that's it
I hope this was helpful