@1
"if its not too late for me to actually achieve something because all GMs started play at 7 or 10"
++ If you equate 'achieve something' to 'GM', then yes, it probably is too late.
However a more modest goal: 2000, CM, FM, or even IM may still be in reach.
i recently got super into chess but i cant stop wondering if its not too late for me to actually achieve something because all GMs started play at 7 or 10