Invisible

Ever felt alone in a crowd of people?
Ever felt invisible even in a smaller group?
i know some of it has to do with me, i guess i'm just a bit socially awkward, but how do you participate in conversations that you know nothing of or have nothing to contribute to.
or not knowing just what to say. i get kind of distracted in groups and will listen to bits and pieces of different conversations which really makes me part of neither enough to fully know what's going on.
sometimes i just wish i could get away from everything but i know i'd miss stuff.
the funny paradox in my life is that i like being around people i actually don't like being alone very much, but i also feel kind of uncomfortable around many people and just want to get away. i think it often has to do with feeling like i just don't quite fit anywhere.
you'd think i'd be used to this by now but it doesn't get any easier over time :(