Elissa.......
If you're not ready to come out, then being caught in a bra will un-delay your coming out in a big hurry. I'm not saying don't wear one, but if you do, make sure it can't be seen through the neck opening. That may require weating a tee or tank under the scrub. Also, and this is personal experience, beware of being patted on the back, or clasped on the shoulder. I also learned, the hard way, to make fast defensive moves against any innocent, perposeful contact with your "chest". One thing I've learned to do, is fold my arms casually when speaking face to face with a male.
I have found that you can get a sport bra by Bali that has skinny straps, and is very hard to feel through a shirt. Also, from the top, it looks somewhat like the top of a wide-necked tee *maybe?*. A size smaller than you would usually buy is perfect. Very flattering.....makes you flatter.
For me? *shrug*....I don't allow physical contact from the guys, but all my girl friends at work hug me, and know what's under there, and why. The popular male opinion that women can't keep a secret, is apparently not true.
Also, looking at your pic....that is you, right?....you might as well get them used to plucked eyebrows right now. The sooner the better. Mine are shaped, thin, and slightly arched. I do mine, and my wife's, just the same. It's been so long, no one remembers what mine used to look like, and now they go totally unnoticed.
Good luck, girl. Sooner or later, just like me, you will have no choice. You are on a direct collision course with destiny.
Love, Bev