I go through something very similar. I have a really high sex drive that I would do whatever it could take me to have sex (eg. there could be a storm outside but I would travel really far or pay a cab just to get some). I would talk to many guys at the same time and have sex with whoever is down for it, sometimes they even invite their ugly friends over without telling me and get me drunk so I'll do them too because they don't care, has happened twice. I have had more than 20 partners and more than half of those I met in 2013. I feel the same way about knowing that they don't care about me but only difference is that I get too attached to them and get upset and cry when they don't talk to me and treat me like *****. My situation could be worst than yours but I was told here that there are ways to break out of this life style, we might be sex addicts and we can get help. I suggest you do talk to those people you mention because they could help you. Best wishes to you, you are not alone.

PS: I'm just 19 years old, male and all this started at 16, for me it has been WAY TOO SOON