Tanning? Ugh, my tan is so weird. How do I get rid of it in the sun? No creams or tanning salons please! Help!

Okay, so my feet, thighs, and arms are tanned in a weird way. My ankles have this line around them, so it's like my feet and legs are a diferent color and it looks awkward. My thighs are white all the way down to my knee where it changes color. And finally, my arms are weird bc/ it looks like I wore a regular T-shirt to the beach instead of a bathing suit. This is all because we did like 45 minutes of PE in the blazing hot sun this year, and that is basically the outline of my uniform. Now that it is summer, I want to get rid of it. It's just strange, bc/ I think I don't think any of my friends have this. Yeah, I mean my mom won't let me use any products or go to a tanning place, so don't suggest that. My only option is pure sun. But every time I go to the beach, I come back the same way, except for my face, even though I apply a lot of sunscreen to it. I live in a place where we get a lot of sun, so I think this is REALLY strange. Am I doing something wrong? Please help me here, guys!Tanning? Ugh, my tan is so weird. How do I get rid of it in the sun? No creams or tanning salons please! Help!
I would use baby oil during the early morning hours everyday it's sunny. Drink lots of water. Then go back out after 4p again. Do that for about 2 weeks and you will even out.