nori wrote: I can't work it out and why am I so nervous around other human beings.
Maybe you are finally realizing alot of humans suck

Sorry just trying to make you smile a little! I actually feel that way about humans now that I am older.
My only advice for starters would be to make sure your girlfriend knows how you feel...I think this is most important!!!! This way she will be more patient and give you time to sort things out with a professional who can give you advice.
Also maybe for the time being...just limit yourself to a few "humans" you feel comfortable around...avoid large crowds if they make you feel uncomfortable.
I for example don't feel comfortable walking around in daylight but I am ok at night...so I tend to take walks at night instead.
Maybe if you know you have to go out then watch a movie that makes you laugh before you go...or watch some funny youtube videos such as Tom Mabe!