how can i face up to him at school . . . ?

[Triplets due in January!]

Well i have my sports class on tuesday morning for three hours at school, well i am the youngest in my class (i am 13, they are all 14,15 and 16) i added some of them on msn including my crush who is also in my class. i added one of the boys in my class who is my crush's best friend, and get on really well with him when we talk on msn. the other day my crush said hi and stuff to me, and told his best friend that i was fit. Well i didn't know this untill his best friend told me on msn, and he was saying stuff like "you've pulled" and stuff like that, and he was asking me whether i like my crush back and i said " he is ok, but i dont exactly fancy him" even though i do! well while i was having this convo with his best friend, his best friend starts talking on msn to my best friend also, asking whether or not i like my crush, and my bestfriend said "i think she does" now his best friend is convinced i like him
i am really nervous for my next lesson, i have even started thinking of skipping school that day!
what should i do, i dont want him to say anything!