I play with three fingers on my fretting hand. When I was born my pinky fingers on both hands do not extend straight sort of a c shape like you explain.
I found the best way for things to work out is to play. You will find a way to work thru the adversity at hand and learn techniques that work for you that none of us can help you with.
Dont let it bring you down, I hear people all the time on my videos say use your pinky more, I try but 90% of the time its uncomfortable or I can make the stretch.
Just play for the love of music and it will all fall into place. Never let something hold you back from your love of music.
There are people on youtube playing with there feet, one bassist with one arm yes one arm and others. Ours are simple things compared to them.
Just play.. Love what you do, and it will come together in no time.