Plz help! How do u change ur thinking about men?

I'm 20..a pretty little chick.I got no problem finding men,I jus happen to always scare them away with my personality..I'm dead serious.I've been ****** over soo much that now I seem to catagerize men..plz I'm only looking for serious replys..plz no ignorance.I use to fall for guys so easily until my last relationship.I fell inlove with an older man.I gave him my whole heart.I made him my world..everything revolved around him..everything seemed perfect..like a love story.then he became abusive physically and verbally..always hittin me for no reason,tellin me I waz a piece of shyt,that I waz his..that if he wanted to hit me he can.he started to scare me everyday.I couldn't listen to certain songs on the radio.he told me those songs were influencing me in a negative way.I couldn't watch tv or go out newhere nemore..I lost all my friends.I pretty much became his property.our relationship started to fall apart..I put up with him becuz I thought I could change him..I felt like I truly loved him..but soon I started to realize he waznt going to ever go back to the way he waz.I ran from him.this chick I barely knew offered to help me leave him..I took the oppurtunity.I left after 2 years..it took forever for me to realize he never loved me,he manipulated n used me..now my problem is I've been alone for a year..n in that year I changed.I built this wall around my personality.I wont let nobody in..I try but in the end I feel like I honestly cnt trust anyone.guys try to talk to me n interested in me,I dnt want to be alone forever.I hate it..but I have no chioce.I've tried everything to trust a man again..but it jus wont happen..I've had 3 diff men in the past 3 month tell me I need to stop cateragizing n puttin them in the same catagory as every other man..I try soo hard.really do..jus my guard wont go down.I scare men away cuz of how I am..not looks.I'm talkin bout how I keep thinking they will hurt me or try to use n manipulate me..I cnt find a guy till I stop this..but dnt k o how..plz if theresnebody that will give me honest advice..ne women who have overcome this? I need help..my head is completley fucxxxed up..I wish I can be normal again:(