Damon's very likely out to make you a fang tramp and Cissie doesn't understand the dangers involved in vampires.
Alright, riddle me this. Dean, who you say was there for you. He doesn't remember the last year either and yet you still cling to him like a limpit. He doesn't know you any better than Buffy but him you give a chance to. Him you let in.
Jealous? ...seriously? Personally I think they have their issues and should deal with it. But that's for them, deal with your own and then ask do they need help.
Get to know the others, get to know other people, like, Cissie, she's a friend, that's good. She seems like a nice girl.
You aren't trying. You're forcing yourself to believe in a family sweeping them into their embrace and a vampire who actually cares for you. Try something real Dawn