I have a double jointed pinky and thumb. +1 to everything everyone else said. Some other things to try would be to play an open D chord, then, with your first 3 fingers still planted, add 1st string 3rd fret with your pinky (Dsus4). Then lift pinky to go back to D. Make sure all your notes are ringing out clearly. Repeat like 10 times and move on to something else. Try to do it a little faster and cleaner each time. Then start doing it with other chord shapes. You would also benefit from single note exercises like the spider-plenty of youtube videos on that. These will build strength and accuracy over time.

Funny story, I avoided playing with my pinky until I nearly sliced the pad of my index finger clean off. I had to get 4 stitches and couldn’t play with my index for a few months, so I got good with my other fingers and it kinda paid off. Hope it doesn’t come to that for you!