Ok, Erie, sifting through your posts and trying to impose some sort of organization on them, I've figured out the following things.
1) You're a very horny 18 year old. You get horny at the drop of a hat and you jack off several times a day. You have a lot of sex with your girlfriend in your open relationship.
2) You've done a lot of fake s/m chatting since you were 13. You're good at pretending to be someone else, and you're so good at it that you're an aspiring bdsm novelist.
3) Your real bdsm experience is very limited. You've played around a bit with your girl and dabbled in bisexuality.
4) Because of 3, you're looking for someone who can help you get some real time experience, either as a dom or a sub. You love your girlfriend, but don't think she's real sub material (or you don't think she wants 24/7, and you're thinking about 24/7).
Do I have this right? Assuming I do, let me offer a few comments.
A) You're sending very mixed signals about how trustworthy you are. You say that for the past 5 years, you've been doing fake sm chatting and pretending to be both male and female and that you're really good at making up stuff, but you also want someone that you can be totally honest with about what you're feeling. As you say, no one knows who you are but you could change that with a long chat. You admit you're a novice, but you also seem to want us to be impressed with how experienced you are at fake chat sex, how frequently you masturbate, and how much sex you're getting. You say that you're very mature for your age, but you produce these very rambling, disorganized posts and say you're just venting, and you admit that you've lied a lot about who you are.
Perhaps you don't realize it, but these things are directly contradictory. In the online universe, you can make up all sorts of stuff about yourself including your sex, your level of experience, whether you're dom or sub and so on. You can also use the anonymity of the internet to be completely honest and vulnerable, explore emotional issues that you're trying to come to terms with, and find a community that will help you grow into a mature self-fulfilled adult. But you can't do both at the same time. BDSM requires a great deal of honesty and trust, and you can't build those things if you're pretending to be someone you're not. Perhaps what you're really doing here is looking for a community that will help you move from being someone who does fake bdsm chat to being someone who is honestly trying to understand his sexuality.
B) Again, perhaps you don't realize it, but your posts come across as someone who's trying to impress us with how sexual he is. That's understandable--everyone your age wants to appear confident, sophisticated, and experienced. But we here at SMplace aren't easily impressed by bragging. We've all read writings by people who are really experienced (so it's not novel), and some of here are fairly experienced ourselves. You jack off several times a day--great, but so do I. You fuck anything that moves that interests you--great, but so do I when I'm in that mood (usually I'm pickier, but I wouldn't have been at your age). What impresses us more than tales of sexual conquest is being honest about what you're trying to figure out, asking questions that show that you've done some reading and thinking, offering whatever insights you have about about your experiences and problems and about the nature of bdsm, and being supportive and encouraging to others.
Reading your posts, I see someone who is genuinely trying to figure things out and be honest about what he needs and wants, but it's mixed in with a lot of apparent boasting that makes it hard to understand what you're saying and hard to trust you. Perhaps I'm misreading your posts and not getting what you're trying to say, but this is certainly the impression I'm getting.
C) The internet is filled with people who pretend to be amazing subs and doms, but until you've actually done it, and done a fair amount of it, you don't know what bdsm really is. You might think you know what pain is like, but until you've been tied down and flogged to your pain threshold, you can't understand that experience and the trust that it can elicit. Similarly, until you've really tortured someone and been forced to look at the part of you that is aroused by hurting people, you can't know what that's like and how frightening it can be. Pretending to be a submissive girl online isn't bdsm; it's adolescent role-playing. There's nothing wrong with adolescent role-playing; a critical part of building our adult identity is trying on different roles and figuring out which ones work and which don't, and which ones we like.
But don't assume that you understand bdsm yet. It's not what you think it is. You've seen the tip of the iceberg, but there's a whole vast submerged world of feelings, sensations, fears, dark desires, bonding, pleasure, and love down there. The mentor you're looking for, and will hopefully find, will help you take the next steps on the path to exploring that iceberg. But that experience isn't going to be like whatever fantasies you've conjured up in your novel. It's going to be different, it's going to be real, and it's going to be way better.