Am I just crazy??

My SO and I have been together for about 6 months now, the relationship progressed pretty quickly and everything has gone great, we even live together for the most part.

He was in a relationship for around 2 years that ended only a few months before our relationship. I on the other hand have never been the type to commit to someone, but have a reached a point in my life where I am ready to give it a shot. In the beginning, because of his somewhat recent breakup, it did make me very skeptical as to whether I was just a rebound, but we worked that all out and have had no issues; However, lately it has started to get to my head that we have not said we love each other yet.

I know it has only been 6 months and many might see it normal to have not said it yet, yet with the rapid progression of our relationship I just feel like it would be normal to start expressing that. I practically have to bite my tongue to keep from saying it sometimes, just because I'm insecure about him not saying it back to me. I'm worried he might not be ready to fully commit, or even worse, he still thinks about his ex.

I know I may be overreacting, especially with how damn hormonal I am lately but bare with me! As I said I have never been one to commit so this is all relatively new to me! Do you think I'm crazy to be so concerned? Should I quit biting my tongue? Help!