It may mean that he cares what you feel towards him and is becoming a little self conscious. Many guys are like that. Try to draw him out by talking to him about something, anything, that may interest you or him.
It depends on how much he really cares about
If a very outgoing guy goes quiet near you and listens to what you say he'll most likely have a crush on you.
It obviously means he gets a bit uncomfortable around you which means he likes you.
He may like her.
it means he likes you
An outgoing guy might like a girl who is outgoing as well. He may like a girl with a sense of humor, who likes to try new things, and is fun to be around.
It means that he is shy towards you. That could mean that he likes you, or he is uncomfortable around you.
Yes,because he knows that he has to act like himself around the one he likes.
The only way to know is to ask him and see, though honestly if an "outgoing guy" is "uncomfortable" around you, it's at least a reasonable bet that he doesn't actually like you all that much.... outgoing people don't usually get uncomfortable around people they like.
If a guy is loud around you, it could mean that he is trying to get your attention or show off in some way. He might be trying to seem confident or outgoing in your presence. Alternatively, he may just have a naturally loud personality.
That means either he's not really into you or he really likes you and i very shy about being around you.
That is possible but sometimes that may just mean he is embarresed to be around you.