Why am I afraid to show up on school?

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I almost don't dare to show up on school becuase I don't dare to meet on a special guy. I know that he likes me. And i don't dare too meet him at school becuase I am afraid that he will see me as another person, becuase I may behave a bit different around him than I did before I found out that he like me. I want to be myself, but I don't know how...
We have a lot of the same interests, and I like to post on fb everything that I do. And I am afraid that he will think that I post alot about the things we have in common just too be "cool" but I don't. He haven't showed up around me in to days, still he had been on school... I am afraid of scaring him away.. Maybe I reacted a bit to big when I found out that he liked me?):
What should I do to stop going around and being worried about so small things?