Do you think my crush is interested in me? also why do I feel worthless when I see him? 10 points!?

[me]

So I was in college last semester with a group of girls in the cafe when two boys who are my friends' friends walked up and I instantly crushed on one of them. He had SUCH an angelic smile and he was so shy and he kept looking at me too. I asked my friend a bit of information about him and I looked at his Facebook and IG off of hers, he is so interesting, and unique which I really liked. I found out he's two years younger than me (which put me off) he's 18 and I'm 20.

I thought I can just forget him but I can't. I see him this semester a lot! Anyway, I can't gather the guts to talk to him. But it seems odd as he's always there. Sometimes he would randomly walk next to me and when I look he locks my eyes amd stops when I turn around. He stands behind me for two minuted getting closer to me then leaves to class. And when he's sitting down at the cafe and I start walking to class, he would stand up as well and start walking where I'm going with his friend, except that he walks on the other side. He's done this 3x already. He's always looking at me. Do you think he likes me? 

One more thing, I dont know why but every time I see him I get so happy but I also feel worthless. I feel like he's so much better looking than me, and that he wouldn't ever like someone like me. I mean he hangs with pretty girls. So why me? I get so depressed and it hurts. I just don't know what to do. Any help?