Welcome to GT!
Keep at it. Stretch while sitting at a meal or watching TV. Stretch while taking a walk. Stretch as you lay in bed. Doesn't matter where and you don't have to overstretch. Your muscles and tendons will start to ease up and allow the stretch. Hopefully no arthritis to hamper the efforts but, if one technique doesn't work, try another.
For example, take a look at some YouTube videos of a guy who has very stubby fingers that don't spread and is confined to a wheelchair... Brock Davison. He uses his special technique to make the guitar speak with great emotion...without the virtuoso hand spread. Warning: You may end up watching and listening for hours.
It's not what you have or don't have.
It's what you do with what you have.
Even with hand difficulties, one can learn to play guitar proficiently. Just have to find what works for you.
