How can I make guys stop think so lowly of me?

[653]

"And no, I haven't gotten molested"
Not sure I believe that; your post sounds very "Little Girl Voice"-esque. Maybe not your dad, but this might be another child.
http://loveline.wikia.com/wiki/Little_Girl_Voice

Anyways...
I get a very high low self-esteem vibe from you (and I can say as a guy that guys tend to be good at picking up on when a girl has low-self esteem). Not normal teenage girl low-self esteem, either...this is way beyond that level. I don't know why it is, but I can also definitely pick up on some major trauma at some point in your life. The "wanting sex at 11" thing is actually really, really, not normal and not ok at all. That's a pretty major warning sign of something deep in your past. Another sign of severe low self-esteem is you slamming people who come on to help you, since a part of you doesn't know why they would even bother trying to help someone like you, so their advice must be worthless anyway (that part of you-the destructive part-that's doing a lot of the talking psychologically).

The reason guys treat you like a whore is because you treat yourself like one due to some trauma somewhere. You admit that you don't like yourself and are extremely insecure, and that "showing off my body makes me feel soo much better, and when guys say they like me or something it also makes me feel better, even if I know they're just using me for something". Okay, that's called a coping mechanism:
http://en.wikipedia.org/wiki/Coping_%28psychology%29

It's just not a very good coping mechanism, and it will stop working shortly, and you'll have to keep going further to get that good feeling back. And guys will keep pressuring you, since they have a reasonable expectation of succeeding (hint: if you're flashing guys, they think you're going to have sex with them. May not be true, but that's what you're telling them; in your own words: "I completely led him on", "I basically dated two guys at once", "I did lead him on too," "I friendzoned Mason at homecoming but then felt horny so I changed my mind and made out with him,".

See, the thing is, that destructive part of you I mentioned earlier? It hates you so much and thinks you are so worthless that it wants to make sure you are never happy, and it leads you into behaviors that are not going to help you and in fact hurt you, and put you in bad situations (this is called acting out).
http://en.wikipedia.org/wiki/Acting_out
You probably genuinely want love and affection from these guys, but also probably can't mentally/emotionally actually process love, so you settle for attention, even if that still scares you in some way.

What you need to do is get therapy/counseling; you will never get guys to stop thinking lowly of you until you stop thinking lowly of yourself, and that's not going to happen on it's own. As long as you are chasing guys, you're going to do that by "being reckless, horny, and stop showing off your body." (that's not your personality, by the way, it's the self-destructive part of you thinking that's all your worth). Even if you go after boys now, you're going to go after the wrong boys or you're going to sabotage any relationships you have because of that self-destructive element.

This doesn't go away, and if you don't take actions to fix it, it gets worse. I'm sorry to say I've met the 25-year old version of you; she's really unhappy, cannot really enjoy herself sexually because she's let so many guys use her that it becomes physiologically impossible for her to connect with someone through sex (she's overloaded the oxytocin receptors up there is the short answer for why). She's banging a lot of dudes, hoping that she'll fall in love with one of them, but she's unlikely to do so (and she has never resolved a lot of other issues she has). The good news is you're only 14-15, so you don't have to end up being her: you can still fix this; it's not easy to learn to love and appreciate yourself, but it is doable.

Good luck and God bless.