The penis naturally is curved. This is common among almost all men. The curvature is typically slight and never too sharp. But there are also some medical procedures to correct it in case there is a problem. To be blunt, unless it has a sharp angle such as 45 of 90 degrees, you’re fine. Masturbation does NOT cause this curve.
The clit and labia are different sized for different women. This is natural. They typically become larger and engorged (with blood) during sexual arousal and then return back to their original shape afterwards. So NO, masturbation does not cause any unusual shapes and sizes.
Color! It’s typically found that those with dark skin have lighter skinned genitals, and vise versa. So nothing to worry about here. Our genitals come in all shapes and sizes. So there is no 1 way or normal looking penis or vagina. Be proud of what you’ve got and enjoy it!