How do i make my skin look natural and flawless?

A couple of days ago i was being stupid and applied sunless self tanner on my body, now i look like a blotchy mess. Now i try to apply different make up materials on my face to match my new skin tone but i cant find anything that matches. Better yet, when i do put on foundation (which i have VERY oily skin) it always looks cakey. And unnatural. How do i get my skin less oily and help with my horrible acne? also i'm thirteen so how can i also do it cheap?