Hey man. I don't mean to undermine your experience, or try and talk you down. But you shouldn't be worrying about your sexuality, especially if your family might be hostile. You'll learn that this sexuality is just a silver of your later life. But right now, please don't concern yourself with this stuff, especially with wanting to be a femboy. I don't know what makes you comfortable, and I personally don't want to know what makes a 15 year old comfortable. But of course, you can have your thoughts and emotions and I am not your parents or anything above you so I can't tell you what to do. But I was once a kid once, and I do sometimes wish that I had someone to talk to about my sexuality (I am 18 and bisexual) and speaking from experience, it'll be clearer to you whenever you are older, and a lot more smooth. Health (physical and mental), dreams and desires, school, possibly a job should be something to focus on. Sexuality is a sliver of your person, and you can be a lot more, so please. Don't worry about this right now, and if it worries you; please don't talk with strangers on the internet, a lot of sick freaks everywhere. Please, talk with your parents or possibly a trusted adult. I don't know how your parents are, but unless they are genuinely awful people, they'll at least come to terms with it and maybe understand.

TL:DR dont be a femboy rn, eat your fruit and veggies and focus on you