I like this guy...but im not sure he likes me!!!?

ok. well i lke this guy, but he liked me in the sixth grade, and we are now in seventh and he doesnt like me anymore, but when he liked me i didnt like him. but now i have built feelings for him. what should i do?!?!?!?! i really dont want to go p to him and tell im that i like him. what if he doesnt like me back?