Feeling like a failure

Mrs • Mother of premie twins. Prayers are welcomed.
My son has been bottle feeding for a few days now. He Brady's during each feed which is really scary. My daughter had her first bottle tonight and took 15 of 33 ccs. But the issue is with me. When I give my son the bottle he Brady's and doesn't finish. The nurses are able to feed him the entire bottle with little to no problem. That scares me because we are approaching time to go home. I know I have to learn to feed him, sideline is the best method. But I am uncomfortable and I feel like I'm not helping his progres. I want to give up and let the nurses do it until he is better. Then maybe he won't notice I am not good at the method of choice. I hope I don't ruin it for my daughter as tonight was our first bottle attempt for her.