Here, you can get a binder free:
https://www.pointofpride.org/free-chest-binders
I have some tips for acting as a male:
1. Manspread - sit with your legs open
2. Stand straight - not only for trans ppl, but helps you look more confident
3. Try to speak in a lower voice (there are many tips on this)
4. If you're in a new place, don't try to look like somebody who doesn't know where to go, but if it's the struggle ask somebody as confident as you can
5. Being a man doesn't say that you mustn't be polite, so always be helpful :))
Try to find a safe space, allys or other trans/queer pplĀ
Hope this helpsĀ