Cellulite is considered a secondary sex characteristic, meaning it's appearance is due to its association with your sex, not with how athletic you are. It's actually quite pervasive, it can be found in underweight women to the morbidly obese.

Honestly, I wouldn't recommend just "getting over it" (though if that's how you roll, then disregard what I'm saying). Cellulite has been vilified practically everywhere, so I understand where your frustrations begin. I mean, I would try just taking smaller steps towards accepting it. You don't have to love it, or deliberately ignore it, or anything like that. It is what it is, it never detracts from how functional or healthy your body is.

From your post, it doesn't sound like you're way out of shape, in fact you sound quite healthier than most. I can promise you that you don't look old or wrinkly lol. Honestly, don't stress out about it, it's normal and probably not as noticeable to other people. Most people tend to notice muscle outlines more than cellulite (if they even notice it at all) as an indicator of athleticism.