Had a woman in class a couple-three years ago who really challenged my thinking on this. She showed up for a two-day, 300-round class with a tiny little gun, her regular carry gun. It wasn't a high end gun, either, being a budget model. So of course the darn thing hiccupped and burped all weekend, multiple jams and misfires. She was a trouper, though, kept clearing the malfs and kept shooting despite growing blisters.
Some time on Day 2, another student loaned her a slightly larger gun, with which she finished the class.
At the end of class, she pulled me aside. "You're probably wondering why I brought that gun," she began (I wasn't; guns that hiccup are part of the job, and so are guns that don't quite fit the shooter. My job's teaching 'em how to shoot the equipment they bring, and sometimes teaching 'em how to make better gear choices in future, but it's certainly not ragging on 'em for mistakes in the past). Anyway.
She then went on to tell me that if she hadn't started with the cheap little gun, she would never have carried at all. Or even purchased a gun. No how, no way.
"I'm really glad I started with this gun," she told me, "because it's the one that taught me that I can do this. Now I know what I need to look for in my next gun. I'm going to try something I can shoot better, and your class really showed me why that matters!"
And that's about it. Shoot what you want. Change guns when you see reasons to do that and are prepared to do the work of learning a new gun. Enjoy life!
pax