This question quite puzzles me. It implies being feminine is a deliberate act, performance you choose to act on when you wish. Not saying that is wrong or anything. But it does imply it's a button you can switch on and off when you would like. That's not my experience at all.
My experience is that everyone outside myself perceived me as feminine no matter what I did, or no matter how quiet I was. It was my energy, the way I talked, moved, sounded, behaved, and yes probably some stereotypical likes/dislikes but even regarding those, if people did not know them, they would still perceive me as feminine if relying only on my appearance and how I acted.
So, no, I can't say I'm afraid of being feminine. I was more afraid of the consequences of being perceived as such, which it did have many, prior to transitioning, at age 18.