The visibility of scars is independent of gender. The reason you have a lot of them isn't because you had testosterone, but because you were trimming trees. If anything, a thinner skin from HRT will give you more scars because some events will injure it but wouldn't have injured the thicker skin you used to have. If you want them gone, you'll have to turn to medical treatments, with a dermatologist, for example. Apart from that, BHA exfoliators can help, but won't do miracles.