I dont feel confident.. and i worry too much?

Alright please help me out here- okay well my friend invited me over to her house and then she called her boyfriend to come. since her cousin was already there that counts as having 4 ppl already at her house before her bf arrives. ( She has me, her, cousin, and sister ) when he comes, we decided to watch a movie for the rest of the night. me and her cousin were snuggled up against one end of the couch while those two love birds were at the other end. my cousin starts laughing, but i dont see whats funny of a guy got hit in the face by two women. (movie) then i start seeing my friend kaitlyn move around.. and i noticed they were making out (They is Kaitlyn and her bf.. chase i think.) that just threw me off guard. then at 12:00 i whent upstairs to go to sleep with her cousin (since we were sleeping over) and i just wonder.. all my life i haveant dated someone... i never got kissed before.. ( as long as i can remember ) and i look exactly like Kaitlyn! either way, i managed to sleep. i woke up with a start but i am misserable, still from the thoughts of last night. anyone help me?