cant handle relationships emotionally...

I am a 24yr old male. i cant date without getting attached. Im the one getting hurt/dumped/cheated on/ pushed away. I end up taking it more serious than the girl. They always start off fine and then all sudden its like i lose control of my mind. i dont have much dating or sexual experience b/c they both end up traumatic to me so im definitely inadequate but I cant get the experience b/c no one wants to deal with me. Im in a relationship(well whats left of it) and im at the 2 month point... and here comes the extreme mixed signals(no need to comment on that), anxiety, depression, negative thoughts, loss of sleep, no motivation, etc... I start feeling like my soul and manhood is taken from me. Then I get the "f**k it!" syndrome where i hate everything and everybody. why? i told myself i wouldnt let it happen this time but its inevitable. And I cant remain friends when the relationship is over. I cant bear seeing them with other men or seeing them happy without me so i lose a friend(which I only have a handful). How can I get over this and be able to have a normal dating life? I know I am self conscious and have a low self esteem but when I am in a relationship I feel great until that point. When I am not in one i feel empty or incomplete... Hearing people talk about their great sex lives and relationships blah blah blah feels like a kick in the junk to me. I like the idea of trying to figure things out on my own but I get lost in the mental tornado and cant get out. Would a psychologist or psychiatrist help or are they a waste to of big money and time? Go to relationship therapy by myself? should i give up on dating? I know time heals the pain but the roots of the problem are still there and they keep growing until they are dug up. ANY help is much appreciated.