First of all, there is a Life Issues subforum that I think this topic would be better suited to. We have a lot of trolls here in Lifestyle Discussion, so don't be surprised if you get a bunch of hate here, and definitely don't take it to heart. They're like that to everybody.
As for the actual issue at hand, I'm not entirely sure how to interpret you when you say you have "voices in your head" and "a bad side." If you just mean that you feel like there's a part of you that always puts yourself down and wants to indulge in self-harm and the like, that's not healthy, but I don't think it's too unusual, either. If you are seriously hearing voices and feel like you have some sort of split personality, that is a serious psychological condition that requires far more qualified help (i.e. a professional psychiatrist) than we on GaiaOnline can give you.
I'm afraid I can't exactly give you a solution, but it sounds like you're very insecure. Getting overly attached to a person (to the point where you get upset and jealous if they're not around you or with someone else) is usually a sign that you're not comfortable in your own skin - you're dependent on other people for happiness. Now, I suffer from a bit of insecurity myself, so I can't give you a cure for that, but the best way to do it ideally would be to find something that can boost your confidence. Take a hobby you're good at or something you don't like about yourself and want to improve and go for it.
In addition, an unhealthy mind (one that's prone to depression, spends a lot of time thinking about suicide, and otherwise puts yourself down for no reason) often goes alongside an unhealthy body. Getting a good amount of regular exercise, a consistent sleep schedule that gives you a good amount of sleep, and a healthy diet can all help you feel better - and will often make you look better, too. If you have serious mental/emotional conditions, adapting to a healthy lifestyle still won't be a cure-all, but it'll probably help, at the very least because it boosts your confidence in knowing that you can change your lifestyle like that.
And finally, a lot of this is probably hormones. When I was your age (I'm 22 now) I was also very prone to depression and high anxiety, and to some extent I still am, but I'm much better now than I used to be, and I think a lot of that is just because all the chemicals going on in your body at that age just makes you crazy. You're like a pot of boiling water ready to burst or something. After a few years it just mellows out. Obviously, if you commit suicide, you never get to mellow out, so I strongly, strongly encourage you to suffer through and stick with it. It'll get better.
Most of what I've said is pretty cliche, but it's really all we on GaiaOnline can tell you. If you'd like someone to talk to, feel free to add me or send me a PM or something. I'd be happy to chat if it'd help you feel better. But you may need professional psychiatric help, depending on how bad this is, so I'll urge you now to try and assess whether you think you actually need it, and not to be afraid of them. There are some shitty psychiatrists who are all about pushing drugs on their patients, and if you find one like that just find a different one. I think they're generally well-meaning and genuinely want to help people rather than "brainwash" people or push their agenda or whatever you might hear. They can help you in ways that no one else can - they have education, experience, and resources specifically for helping you. So don't be afraid to ask to see one.
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