Ok so, I'm sure I'm nonbinary, and highly probably neutrois/agender, and here is my problem. Where I live, the language we speak doesn't offer neutral pronounce and almost any neutral word. So after a lot of wonderings about myself, the life I want to have and how I want to be considered by society, I've come to the conclusion that I would prefer to be a nonbinary boy. I think that would suits me better and also be better for everyone. So I took a big decision, I want to be a boy full time. Now of course, I have lots of questions for you guys, I hope you could answer them

1- How do I come out to my friends ?
That really scares me because I have few friends I really care for, I don't imagine living without them and I'm afraid I will loose them. I just want them to understand me without freak them out.
2- What should I say to people I'll meet next year ?
Hopefully I'll graduate this summer and next year, I'll go to uni. So of course there will be written "girl" everywhere on my school forms. But I want other students to refer me as a boy and make some friends as a boy.
3- Which bathroom do I use ?
Especially at uni where people will know me (in public places I don't really care tbh, I'll never see those people again)
4- Should I take T ?
It's not really on the agenda but I prefer think about it in advance. I'm a bit afraid of that because it would have some consequences I couldn't I couldn't hide, and I would have to come out to my extended family (such as my grandparents, uncles, cousins etc.). And I 'm not sure they would accept that :/
Thanks for reading !