Hey & welcome!

What kind of guitar are you using?  Can you post a picture of your posture & hands playing guitar?  That info would help to figure out any potential problems. You might consider standing or at least wearing a strap.  This tutorial covers proper posture & body mechanics.

https://www.guitartricks.com/tutorial/1141/

Having said all that, you might benefit from a guitar with wider string spacing & or long scale length.  With that in mind you could go to your local guitar store, explain the problem & try several guitars to see if another one fits your hands better.

Hope that helps!