Did I make a mistake in breaking up with my girlfriend?

I just broke up with my girlfriend of about a year and a half a few days ago. I'm 22, she's 23. She moved in to my apartment about a month ago. Today she moved out.

During the christmas break I came to realize that I felt like I needed to be alone for a while. I've felt like this before but it really came out after my mom suggested I think about where my life is going and if I really want to spend my early twenties with a girlfriend who I may or may not end up staying with forever.

So I decided to break up with her. I figured we're both young and I want to focus on my career and she hasn't been as creative as she used to be when we were both in school. I want her to be as creative as possible. We tried writing together but it just didn't work out. The drive to write/do stuff died down (at least for me) when I have the ability to snuggle or have sex with a girl I love.

So it's sort of which is better... focus on a career and creative endeavors, or stay together with the girl I love. I tried both at the same time, and it didn't work.

I'm embarrassed because if my mom hadn't spoken to me about it, I wouldn't have broken up with her. If I didn't go home for christmas I wouldn't have broken up with her. If she came home with me to Christmas, I wouldn't have broken up with her. I'm afraid this annoying sequence of events made me want to break up with her. Maybe it would have happened sooner or later though anyways.

She honestly was my "favorite" gf I've had (3 total), and I am afraid I will never meet another like her.

So my question, do you think this was a mistake to break up with her? I feel as if you're all going to say it wasn't a mistake but I needed to tell someone/the internet, so thanks for reading.

By the way, this is my first time as the breaker-upper so that may have something to do with it.

TL;DR I'm 22, thought it might be a good idea to break up to pursue my career, now I'm sort of regretting it, was it a mistake to break up?