So I'm not even bragging but girls seem to only want either nothing to do with me or a relationship.

Nice girls, bad girls, shy girls and slutty girls all want something real with me. Now I'm not saying I'm getting girls left and right but when I do this happens. I've been in a relationship and I hated it.

All I want right now is a fb but they want me for themselves. So I rarely talk, but people tell me I'm a cool guy. I also realized I'm somewhat good looking. I don't want to be a douche and just use them for sex but that's not what these girls want.

There is not such thing as "use them for sex". The sex should be good for them too so you are using each-other at most
For me the following strategy worked: escalate as quickly as possible and don't call them again after sex. They will call you eventually and become your fuck buddy. You will fail a lot but the remaining ones will be into you only for adventure not for the relationship.

You can always explain how you're into open relationships, because you disregard and dislike "traditional" relationships. You can also give examples, like "if you had two children, you'd love them equally", etc.

I am not a big fan of relationships either. Being in the navy has kind of made me hate women because I also experience this a lot on my ship. Total sluts will call you a player for approaching them and it makes me very angry for real.