No, you probably didn't invent it if you felt these feelings at an age too young to even be fully aware of gender and its implications but were bothered by gendered clothing and body parts.
There's no body parts of mine that I hate more than my secondary sexual characteristics, and why? There's no personal conscious reason at all that I should have such a problem with them. The problem is there regardless of how I feel about them, whether I try to talk myself out of caring, or not. The best indicator that something is truly up is if you still have that same level of discomfort years later, and if you had them long before you'd ever heard of phrases like "misogyny" and "transphobia" and "sexism". If they were there before those things could consciously color your judgement, then they are unconscious/persistent phenomena and probably a trans condition.