Why have i reverted back to my child like ways?

im a 16yr old girl and i think i might be obsessed with child things, not children but toys, cartoons, cutlery, i used to be ok but its gotten worse. i love marvel heroes and i hav so much spiderman stuff its beginning to worry my family. i have a 21 year old boyfriend and im not sure if hes bothered by it or wat. i moved to another country and lost family/friends from this. my cousin came into my room and saw all my stuff including my comic hero themed under wear and asked why i liked boy stuff. and i couldnt answer hime cos i dont know why... why have i grown down instead of grown up?