What's in the mind of teenage boys?

I went to the national physics olympiad in my country and I stayed from Friday evening to Monday noon in the capital city with a headteacher and 2 other boys. V (16 y/o) and N (18 y/o).

Monday morning we were all tired af and in the car there wasn't enough space and the teacher told him to lay on my thigh if he is REALLY sleepy and he didn't want to but I told him it's okay and took his pillow and put it on my thigh and then he fell asleep in under 3 minutes.
And I'm sure he doesn't like me back but omg I like him a lot and I have his insta but I don't know if I should text him cause he had tons of messages on insta those 3 days and I feel like he's popular in his school)

Now there's this other boy, E (17 y/o). He is from another part of the country and he is from the same hotel room with V and N so he came with our group (the teacher, V and N) to walk late at night and then we all came into my and teacher's room and played games till 1 am (that's why on Monday we were all tired af) and we talked and whenever he laughed he would look at me and he asked to see the books I bought and told me that he also bought some cool mangas and shit. And I actually was so happy because it was so easy to talk to him. AND he was a bit shy.

Now, I also have his insta and I texted him. He replied insanely fast (like less than a minute) and we talked for about an hour. And then at about 11 pm (like an hour after we stopped texting) he sent me a video of an anime (idc about anime but that's the only thing I knew about him). The next day, he didn't text me at all. And I didn't wanna seem desperate and didn't text him either.

Today I texted him tho, about a photo that he might wanna have (the teacher took a photo of all of us but he wasn't in our group so he didn't have it) and then we talked for about 1-2 hours. But the 2 times we talked, I asked most of the questions. Like the only question he asked me was where I'm from exactly.

I like him but I don't know if he likes me back :/
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by the way, I'm 15 and ik that liking a 17 yo is weird. But I wanna be at least friends with him. A friend won't hurt, right?
What's in the mind of teenage boys?
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