forgot security question to change iCloud password
So heres the thing, for the life of me I cannot remember my iCloud password. I need it so that I can change my lock screen password from my icloud password to a new password I can remember. I also can't remember the answers to the security questions from years ago. if someone could please help me out i would really appreciate it. Also, if I were to go to the apple store could they possible help me out? thanks
MacBook Pro