I can't wear a traditional thimble either. I have found that Japanese thimbles are the best for me. There is one that is shaped like a ring, with little indentations all over it. I can hang it on a chain around my neck when I am not using it and it fits firmly around my middle finger, between first and second knuckle. I push with the underside of the ring instead of my fingertip, whilst my fingers hold the needle. There is a leather version which has hard plastic inside it. The other one I use is a Sashiko thimble, which is also Japanese. It is also in the form of a ring, with a small disc on it that fits into my palm. Clover make all of these, so why not give them a go? With a little practice, they are easy to get used to.