You mean, kind of like a nickname? I've never done it but I have a friend who did. He despised his name and he essentially took on a whole new one, even his Facebook, etc., isn't his real name but rather, the one he prefers.

It generally only works with people you're just meeting. If you have friends that have been calling you your regular name for a long time, it might take a lot longer for them to catch on.

Would you only be getting people to call you by this assumed name or do you plan to legally change your name?

I know that when I get my wedding certificate in the mail, I'm going to be assuming my husband's last name.
Not legally taking it mind you, that's a hassle I don't want to deal with but I can just present my marriage certificate at the government office and change my name on all my IDs and legally, I can go by either my husbands last name or my maiden name but on my birth certificate, my last name will still be my maiden name.

theres this guy i know that is called Akgo (aahkho) but everyone, even his mother calls him timothy

Same deal with my ex.
His name is Sayyannarra(Sigh-a-nara) but everyone calls him Dave.

I know a boy called Sebastian who calls himself Bill