husband has many female friends, is that normal?

My husband has many female friends. Actually, I've been aware of this since we were dating before marriage. He's genuinely kind, so many girls feel comfortable being friends with him. Initially, I didn't mind and even found it cute. However, as we entered the third year of our marriage, I started feeling somewhat disturbed... especially when he went out to hang out with his friends and they didn't allow him to invite me. I have to admit, his friends aren't very friendly towards me. They barely greeted me on my birthday. I don't like it, and I want my husband to stop being friends with them... am I being overdramatic?