I felt exactly the same way you do 5 years ago, so I'll give you some 'advice' based on how I now look back on my life at that time.
The reason you feel like you won't do anything with your life is because you are currently not doing anything with your life and your bipolar disorder (I don't know if you're another 'self-diagnosed, not-really-biploar-but-claims-to-be-because-it-sounds-angsty-and-cool person, or if you're legitimately unwell, but I'll give you the benefit of the doubt) makes it hard to have optimistic aspirations.
What a lot of people who have never suffered mental health disorders often fail to understand is that it's NOT as easy as taking up tennis and suddenly finding that you're feeling a little chirpier. Depression of almost any kind hugely affects your will power which is why it's so hard to beat for some people. It's like the scene in "See No Evil, Hear No Evil" when Richard Pryor tries to get Gene Wilder to hear (despite him being deaf) by screaming in his ear. It's not as easy as just trying harder and harder to hear something and eventually your deafness goes away.
I don't know if you've seen a doctor or therapist at all, it can't hurt to do so if you haven't but I'll not labour the point. what I found is, you need to find a "coping mechanism" and you've found yours in music, which is what I did. Let your music have that healing power over you and it'll get you through some hard times as it did for me.
BUT - here's my advice (and everything I say here I say not out of cruelty, but embarassment over how I acted between ages 16-20ish).
First, don't be ashamed or embarassed to call a helpline. I do a lot of work for/with a charity called PAPYRUS who specialise in helping young people through depression. Info here:
Prevention of Young Suicide - PAPYRUS UK
Second, being an angsty teen is all well and good, most teens are, but if you need to talk about it (which at times, you will) pick your outlet carefully. People can be very insensitive and not understand what you're feeling. The long and short of it is, you can end up appearing to be just a mopey little bitch (as I did) when in reality you may have a very serious disorder.
Third, never ever, EVER think that girls (or guys, or whoeveryou like) like guys(assuming you're a guy) who angsty and depressed. They don't. Be yourself, but don't ham it up for sympathy. Doing that just breeds more people who think of depression as "no big deal".
Fourth, there are forums dedicated to people who are depressed or suicidal looking for support, but take everything you read there with a pinch of salt if you decide to go that way. I'd recommend talking to someone from an actualy charity/professional organisation about it.
Fifth, It gets better. The only exceptions to that rule are people who go out of their way to make it worse (drugs, alcohol et al).
If music helps, let music help. It helped me. Just don't make the mistake of thinking that people who haven't suffered what you suffer with will care. Most people just don't care and that's the hard truth. Especially on the internet.
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