my minecraft that i bought turn into the free minecraft and i cant go to my bought minecraft i can only play the demo

so i was helping my brother with his computer to download free minecraft to try it out then he made a different account from mine his is kskong10@gmail.com and mine is somewhatmilk@gmail.com then when it finish download i came to check my minecraft skyblock hypixel to see if i could finally play from the new update happening and it says you dont own minecraft you can only play the demo I REQUEST TO HAVE MY MINECRAFT OR A REFUND I HAVE PROOF FROM MY SKYBLOCK HYPIXEL GO AND CHECK THAT PLS RESPOND SOON I RLY want to play minecraft again its the only thing i can do for fun in my free time cause im not paying $27 again just to play it