Pics would be great if you would post some. That would really help with the advice you will receive. Chances are they are not as bad as YOU think but the brothers here will be honest with you.
Every stretch mark I did have faded to the color of my penis skin so they are virtually invisible. I only have 3 areas of permanent scaring, the stretch mark on the bottom of my penis, a bruise mid-shaft that I worked through and made permanent and the loss of my Frenulum. Not bad considering how much I put my cock through.