I can't stay committed to anything?

[Lauren]

I'm 18 years old and all my life, I’ve never been able to be committed to a hobby, activity, sport, etc. for very long. Just a year ago I begged my parents for a bass guitar, and now it sits collecting dust. One week I’m obsessed with a TV show, the next week a video game, the next a book series, and by then I’ve lost nearly all interest in the TV show. I have a few main interests – music, media arts, cinematography, psychology, social justice – but my focus on each changes so often that I’m not completely dedicated to or talented in one or the other. I’ve managed to play piano and violin all my life, but even then I often lose motivation. Currently I’m interested in taking up figure skating (I have been for a long time), but I’m not sure I’d be able to commit to the hard work needed to be good enough (plus I have to wait another year; there isn’t a skating rink where I live).

So basically, I’m fatally indecisive and uncommitted. Sometimes it gets in the way of schooling and even relationships with family/friends. I don’t know what I want in life. What can I do about this?