I Have Anxiety Attacks

I'm 20 years old,and i have been having some problems since early teens.I'm in to music,acting,and all sorts of sport,I'm a really out going person.I'm having an odd feelings in my head all the time,and some anxiety attacks,It's like going from happy and having a laugh to just been blank and just panicking that people is reading my head and thinking about me.I also cant concentrate and thinking straight around people,I always have these feelings and emotions in my head that's every body is looking on me,I now because I'm going nervous and start twitching and panic.But i now inside that's i got lot more potential and theres lot of things stoping me from reaching my goals