Need help selecting gun

I’ve been sampling for a while with what to carry. I bought a Glock 19, but when I was shooting it I noticed that it had a tendency to move around a lot in my grip. I compared it to the 43x, XD-S, and a Glock 45 and had the same problem on everything except the 45. I’m a small-ish dude so I don’t feel that I can conceal the 45. Any tips on a more full-sized option similar to the 45 but easier to conceal would be greatly appreciated.