Why do I feel like this?!

;) It sounds like you already described it! You're nervous! It's a perfectly normal reaction when talking to someone who you may think is cute or have interest in in any way. Just try to relax and don't stress out when talking to him.

Relating to your question.
First i need to understand what is the meaning of nervous to you....not taking this in the question the i suppose you ought to like him or i don*t know what else to say because i don*t know you either your feelings about other people or your principles.

it could be a case of "puppy love". the body as well as the mind is going through some changes. the nervousness is normal. if you really, really like him then just talk to him. talking to him will be awkward at first, but it gets better. you will be just fine. good luck!

That you like him!

love