If he is mean to you tells you his secrets he likes you
If you like a guy than just make A LOT of I contact and flip your hair make him laugh laugh at his jokes and start out with friends.
Yeah, do what they said (all the other answers.
But KNOW: At 13, both boys and girls change unpredictably and really fast. So any one guy is a moving target.
REMEMBER and live by this: If you want to be happy in life, attach yourself to a goal, not a person or thing.
That said, have fun. And be forewarned, the guys are about to go into sex-crazed phase. Most will try anything to get in your pants and most, if successful will forget you afterwards. If not successful will dismiss you. Just how it is. Good luck.
In third grade, getting a boyfriend mightn't be the priority.