How can I enjoy myself?

I have a hard time living for myself, doing things for myself and enjoying it. It is like I am not worth taking care of. I hate to do things by myself, just me and myself.
I love to do things for and with my daughters and my husband but when they are not around me, I feel terrible, alone and I don’t know how to enjoy this free time and this me time.
I would love some help on this!