More, I wouldn’t say that you need therapy and I don’t think it’s not a normal feeling.
What I would say is that halachically all money made by you belongs to your husband, so there is no money that is really yours unless your husband gives it to you to spend however you want. Having a good feeling about contributing to the finances and being able to spend a little extra on something you really want is a very common feeling, but not based on any halachic difference in whose money it is. (Does this make sense?)
I would maybe talk to a Rebbetzin who could help you get a different perspective on incomes and spending $. You probably feel like it’s not something that you “need” but something that you want, so you feel guilty. Isn’t guilt a Jewish emotion?
Again, hoping you find the right balance for your marriage and family.