When I was growing up I went by the name Angie. It wasn't until I became an "adult" at 18 that I decided I wanted to go by my full name Angela. I thought it sounded more mature and I hoped that people would take me more seriously. I don't think it worked, but the name definitely stuck. Especially because it was how I introduced myself to my husband who then thought it was "the most beautiful name in the world". He even semi-cringes when he hears people call me Angie.
So now that I have reconnected with all these people who call me Angie, I find myself introducing myself as Angie with as much frequency as I introduce myself with the name Angela, and then have people saying things like "oh wait, I thought you went by (insert variation of my name here), is that wrong?"
And the honest answer is I don't know, because I don't know what I want to be called anymore, and honestly, I don't care. I would prefer if people just called me whatever came naturally to them... as long as it's not mean.