I don't want to grow my hair for a friend's wedding
Why not just grow it out for your friend?
I don't want people to notice me looking different.
It is your hair and you can do whatever you want with it. You are not obliged to the whims of the bride and groom, it is just one day. They need to focus on more important things than someone's haircut.
I just want to be my own person. My hair length or style is not how I want to be remembered as a person.
I think that you should talk to your friend then. I think that you should be able to have your hair at a length that makes you happen even on their big day.