Ok so i need some help

So I came out to my friend and cousin as nonbinary. I'm scared to come out to anyone else. The real problem is that me and my parents are moving and I'm going to be enrolled at a new school. Obviously no one at that school is going to know I'm nonbinary and that i use they/them pronouns but I feel like I should tell the teachers and students just so I'm more comfortable. But at the same time I feel like they're going to be homophobic and shit and not respect my pronouns because of it. So should I or should i not tell them once i start school?