Underage little confused

I’m nearly 15 and I’m a little and I have been for some time now, could anyone tell me why I go into little space? I go into little space really hard aswell. I have depression and anxiety and ptsd, do I use my little space as a coping method? I’m so confused and I don’t know how to go about this because I go into little space at home at school and when I’m out with my friends and I can’t tell anyone cause everyone will probably think I’m weird?