Please can someone help me. i have a BoyProblem- if bạn know about this sort of thing:

thanks for clicking, i hope bạn can help.
ok, this is going to probably sound a bit weird hoặc something you've heard millions of times before, but i have this problem and i don't have much time:
last năm at school there was this guy i really liked, he was like so amazing and lovely but i was really nervous and i couldn't really explain to him, and i must admit i acted a bit stupid because i couldn't think what to do and i knew he was leaving soon - and my Những người bạn weren't much help - so eventually he got the wrong idea and went to college. he left school without me getting a chance to tell him. that was this time last year, and i haven't seen him for a year, i've only seen a few of his mates who i don't know very well, and i don't think he did either.

BUT, today there is a school danceparty at this building near my school, and i just found out today HE IS COMING i'm like 'what am i going to do??'. bạn see, in the end he didn't really know i liked him,and it was a bit awkward, so it's going to be a bit wierd if i go up to him and just go 'oh, hi, i haven't seen bạn for a năm but i meant to say i have this mega crush on you' he'll think it's a bit wierd.
What am i going to do? has anyone been in this situation before? what should i say? should i go up to him?
i don't know what to do, i'm all over the place and the party is in two hours! please help!
thankyou so much xxx Lottie xxx