Checked out your myspace... shows in the basement, recording, promotion. Seems like you got a lot of things going on for 15.
Ok, sometimes you just have to do the best you can with what you have. I don't know everything you are trying to accomplish but I can say that when I started out the best thing i ever bought to improve my mixes was a pair of studio monitors. They help for tracking, mixing, quick mastering. Just to listen to something that isn't muddied by bad heaphones (or those boomboxes with crazy eq presets) can really help.
I do have to warn you that all of this is an addiction and every cent you earn from now till you get married will be blown on equipment, software, books etc. So tomorrow you get some monitors, for your birthday you get a condenser mic, then you save for a preamp... it never ends.