dont know

hi everyone.. i am 20 yrs old. i pull my hair, bite my cheeks,  oscillate my body or legs to and fro.. its like automatic.... i also forget quickly..takes  longer for me to understand something.. also im absent minded..i also cant concentrate properly.. also when talking to some people i dont feel normal.. i get blank.. i freeze.. no ideas come to my mind at those times..also when im with a group of people its much worse wen all the people r looking at me.. i jus blabber something.. later i think as to why i said that.. i dont know wat the exact problem is.. pleeeeeaaaaaseeeee help me........ 

Welcome outofideas,
What you are going through sounds very overwhelming, I second Nanners in suggesting it would be best to talk to your doctor about all of this. Also it is good to hold onto the idea that sometimes we can "overthink" a situation. Often what we percive as "blabbering on" can just be normal chatting. Don't be too hard on yourself k? Stick around and let us know how you go.