Jabo I think the most important thing I can communicate is to not take things so seriously. "Success" (ie good grades at school, recognition for doing something like music, getting a prestigious job +/or making lots of $ in your career, attractive romantic partner) is not really that important in the scheme of things. Most people who think that if they could just achieve things they'd finally be happy just discover that once they meet their goals, it's not enough, and they still are repeating their same destructive patterns w/ nicer scenery and less stress about $.
Doesn't really matter what you do, as long as you do your best at it, are kind to people and have friends, and spend most of your time doing things you enjoy. Of course you need to find a balance between preparing yourself for a prosperous and successful future and having as much fun as possible, which I think is the dilemma you find yourself in at the moment.
But from a zen perspective, don't think it's ever worth getting stressed or ruminating on things you don't like in your life or ways you are not putting in your best effort. Either do something to change it, or accept it and relax. Easier said than done tho, obviously
And to start taking things less seriously, I suggest you start by laughing at this newspaper article that I originally came into this thread to post