I'm 16 and a guy do i have social anxiety because when ever i'm around guys my age i feel really nervous excepcially if there goodlooking?

You have social : anxiety in situations in which you fear embarrassment or judgment, but social anxiety disorder has more symptoms than you report. See http://www.nimh.nih.gov/health/topics/social-phobia-social-anxiety-disorder/index.shtml. Take debate/drama, join a club in your area of interest & talk to a trusted adult. All kids your age have self-doubt, but some know how to fake it till they make it. Be you!

Possibly: It's hard to say for sure based just on this information. One way you can get a better idea would be to take a standardized screening questionnaire like this one: http://psychology-tools.com/spin/ Whether or not it is technically social anxiety disorder (sometimes called social phobia), it sounds like it bothers and affects you. You might consider talking to a counselor about it.