I'm scared to take the first step

I want to move out from a toxic environment. But I cant seem to take the first step. If I leave, there's no coming back. I'm constantly scared that I'll forget something of importance when I leave, and would never be able to come get it.

I also feel like I need someone to tell my goals to and ask for advice and such. Someone that can provide the emotional support I need to take such a huge step. Maybe a mentor of some sort. Where do I find a mentor that deals with life advice, personal goals and problems, etc?