I remember learning to play this stupid chord for a couple of months. How I used to look up my favorite songs and pray there was no F in there! It really was just a matter of practice until they became natural and now, they're probably the chord shape I play the most since they're movable!

I'll echo the advice from some others in this thread.

1. Getting your thumb in the right position to support your index finger takes a lot of the stress and fatigue off your hand
2. rolling that index finger a bit more to the side lets you use the straighter and bonier part of the finger so it's easier to keep the pressure applied to where you need it (which is really only 3 strings)

Good luck! Eventually when it clicks you won't even think about it anymore ☺️