How to even out skin tone on legs, remove stretch marks, and dark pores?

I'm very pale and have very sensitive skin. If I lose or gain the slightest amount of weight, I'll develop stretch marks running all the way down my thighs and calves. On top of this, my pale skin looks as though I've wrapped my legs with bands and then released them, as the color has hues of purple, pink, and white, of course. I also have EXTREMELY dark pores and I really want to get rid of them. I'm only 18, so my skin isn't wrinkled and I'm not overweight. Please help me!!

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