Am I straight or gay?

Ok so Im 18 and Im pretty confused I guess. Throughout my life Ive liked girls but Ive never had a girlfriend and Im a virgin, I was always too scared to speak to my crushes in High School so I never really got anywhere. Im not attracted to men at all, but I might say like "oh hes handsome, probably gets alot of girls" or something like that. But its just a feeling I get that makes me feel like I am gay. Or is it just a phase I don't know. Another thing is maybe my lack of experience with girls. What do you guys think?