How do u tell if a guy likes u?

Well this guy that i like.. i think he likes me but i dont know..
he is not the most atractive person.. but he is sweet and funny. Some
times i just wanna tell him that i like him.. but everytime i am around
him i get so nervious and i make a total fool of myself. he makes fun
of me when i am a dork but we like to talk to each other. He askes me
to go over to his home just to talk to me. Well we talk about different
stuff like relationships...life and PARENTS! lol but i have no idea if
he likes me or not. everytime i wanna ask him i get to nervious!!
give me some advice ppl!
love U ALL!
Amy