Should I just give up?

The Guy I like Not naming any names so I should call him "HE" lol
He is a T.a meaning he a teacher assistance,And he a 2 years older than me.To tell you the story in the beginning
here it goes....
 4th period I have PE. And we have 2 t.a and it all started with a smile. he smile at me like one has ever did. My friends kept on telling me that he like me.because he kept smiling at me. but i didn't believe them. ( that was all in one period) the next day.. i guess his best friend sister went up to me out of no where and told me if i like him.
of course i said noo.. sooo two days later while my grandma was taking me to school i saw him in his car at the stop sigh. we both stare at each other. then i look down because i was shock! I saw him,, In 4th period he went up to me and I was so dumb because i didn't know what to say. But he was telling me that he saw me in the car and yea.. it was so awkward. so now we just smile at each in 4th period and while I am walking to 6th period.    I always think is just in my head?  should I just give up? or does he like me? So many questions i want to be answer.