How can you tell if a guy likes you?

I went w/ my bff who's a girl to Dixie skateland. We are both single now and we kept getting asked to couple skate by other guys who were a lot older than us. We went t D. Skateland to try & get guys she's had a boyfriend once but she broke up with him because he was too over protective and thats the first bf she's ever had. I have never had a bf I'm too shy I basically ignore them and just hang out w/ my other friends & at skating we didn't get any bf's but it is definetly time 4 me 2 get a bf i am ready. But i amvery shy & won't ever have the guts 2 ask out some1 so what i want to know is how can you tell when a guy likes you? please help ;( p.s. guys 2 can answer i want 2 here your side of it.