Once you start to use them almost every day you'll feel so much better, even if it's just to go to the supermarket, pick up the kids or visit family they'll give you happiness.
Just a suggestion but perhaps just pick two or three to have in rotation for one season and get used to them. Even though I have lots of bags I have about five on the go at once but no more. There's no guilt attached to the ones put away because I know I will use them. The more I use my bags the more they become mine, and the more I love them.
I don't use most of my bags straight away, especially if they're top end of my budget, I have to wait until I forget how much I paid and sometimes I like to keep some really special bags just for me - before I share them with the rest of the world. In the end there'll be that outfit or occasion I need the bag for. No harm in behaviour if you understand it, we all have 'our little ways'. Try not to feel to upset with yourself and see how you feel using your beautiful bags, even if it feels weird or you don't deserve it etc, it will become a part of you soon enough and you do deserve it, they're just beautiful objects and we must give them purpose.
