What am I supposed to do?

- I'm 18 and he's 16. We see each other in school, but I never talked to him. It all started when I sent him a friend request on facebook. He accepted and I was sooo happy I couldn't think straight for 2 days. I poked him first but he didn't poked me back immediately... he went offline the moment I did it. 'I poked him so hard he went offline' I joked while talking with my friend. The 下一个 日 I saw him in school and I just looked away, It wasn't on purpose. I just freeze whenever I see him. When I got 首页 I saw a notification that he poked me back.
- I sent him a message: 'Hey :) I see 你 often in school and I think 你 are really interesting, I would like to know 你 better, If that's fine with you...' .... for a WEEK he didn't answered. In the middle of that week I gained a confidence to approach him.
- I was standing on the bus stop knowing that he'll come. I was sooo nervous... with a corner of my eye I saw him approaching the bus stop. And than it happened. I blocked out.... I couldn't catch my breath. I turned around and looked anywhere except him. For a 秒 I saw our bus arriving and there was a cab in front of it. He hurriedly took a cab! I.... I ran away and cried myself down on the bench. The 下一个 2 days went painfully. He would look at me but quickly and scared. Sooooooooooo... I have sent him ANOTHER message. I was a long one. I apologised for causing any discomfort with my 前一个 message. It was the most decent message I have ever came up with. My 老友记 supported me and I pressed 'enter'..... He didn't respond but he HAD SEEN it! I don't know what to do.... He looks at me, I know... and I would really want him to approach me... cause I can't function in his presence.