Breathing techniques for singing?

I'm 14 years old, my voice sucks, I cringe every time I hear it, I have come to terms with the fact that I have no vibrato and never will, but I was just wondering, does anyone have any breathing techniques or any tips AT ALL to improve my voice? I'll do anything, I sing mostly blues music (Janis Joplin, Big Mama Thorton, Bessie Smith, etc.) Any tips at all are greatley appreciated! I desperately want to make my plain bad voice sound better and more pleasing. (If all you want to do is insult me or tell me I shouldn't be singing blues for various reasons, please dont respond, I dont appreciate immaturity).