MC SKIN HELP!!! (CLOSED)

Help!!! I want to change my minecraft skin, but when I try to log in it says "This is your first time logging in to this account on this compuer" or something when i've always logged in on this computer, and since when I made the account secerty questions where not required yet... But I can't make a new account and migrate it to a new account because I made a mojang account a little bit after I made the minecraft account and now it says I need to awnser secerity questions that were never set up, and when I try to reset them I'm logged into a diff mojang account I made trying to get into my original, so when i send a reset email, it is to reset secerity questions for a account without full minecraft, and since i cant migrate minecraft to that account, i'm screwed, all I want to do is change my skin! HELP ME!

I don't want to have to buy minecraft again, I try to use my new account to log in to full MC but it says "Failed Login" witch I understand, but is there no way for me to beable to change my skin? Is there a way to log into a diff mojang account? All I do know is that logging into minecraft is the only way to log into mojang, and how can you reset something for a diff account when your on another account?

PLZ HELP!