are my feelings normal?

I signed up for this site becuase I want to know if anyone else feels like this... Im a 19 year old girl that has had a good life but i feel depressed and unsure about alot of things. I get depressed for a couple days every month or so. I work part time, live on my own and take 3 university courses.. that would stress any teenager a little bit, but I dont know how to deal with things. I had a serious relationship with a bisexual man until recently.. he was not a good boyfriend and always worked to change me. I could never be myself and he didnt care how much he hurt me.. now I have a really awesome boyfriend now, who im having trouble being with. I care about him alot but its almost like I loose emotions every couple days where I really dont care If he stays or goes. I dont like realtionship and have a hard time with boys... im uncomforatble and awkward with myself and how I feel about them. I was sexually assulted for 5 or more years from the time i was about 3 until 8. I cant really remember that young but I think it started about then... anyway I dont know if this is a side effect of being molested. I have always been sexually permiscious.. sex really doesnt mean that much to me. Relationships make my life feel unbalanced.. i go from happy to depressed.. and im stressed. I really want someone to love and share myself with.. but i dont feel like im whole.  Is there something wrong with me??do people that have not been molested feel this way?