Hey Alex!
I totally understand where you're coming from. I'm not able to transition where i'm at either, so it's very hard when you feel male but your body is like... 100% female. Some advice that i can offer you is that little things matter. All the little things.
Things I've done: got a haircut! Haircuts are surprisingly uplifting and gave me a huge boost of confidence. If you can't cut the hair for some reason, just pin it back! Hey, you might be warm that day or something >> Also, getting male scents or deodorant that you can wear. If you can't bind, try other 'slimming' bras and whatnot. Sports bras n' junk. Not to mention they're way better than snapping on something with a stupid wire *shudder* ugh.
I assume you're younger? If the case of the skirt is a uniform, then my heart goes out to you as that's how I climbed through school. In an awful skirt. But hey, even though you have to be that way at school doesn't mean you're any less of a man. Get home, put on comfy clothes that make you feel good, and just be. Little moments like that help as well. Acting like your true self is the key. Confidence will come with time, I'm slowly learning this. xD
*hugs* You can do it!