shoulder pain when doing dips

hi guys,
i was wondering if somebody could help me out here.
When trying to do dips, it feels as if i’m not able to get a good range of motion. After i lower myself for a bit, my shoulders start to hurt. I consider myself to have reasonably good flexibility in that area. It seems that my upper arms will only go as far as 10-15 degrees below parralel to my shoulders, which i think would be a very low range of motion. my hands are spaced about4 inches each from my body, with palms facing each other. If anybody could help me out, i’d appreciate it.
Thanks

you should try putting