Am I being jealous and insecure??

My boyfriend and I have been together for 2+ years now. I've been having these issues. I don't know if it's insecurity or what! I want us to be bestfriend where we do things together. Whenever I go to a party or function I include him. Unless it's one of the few girls nights out. With him he doesn't give me the same treatment. He invited me only when he wants me around but there are a lot of times when he doesn't. like motorcycle bike run out of town or when he goes to biker parties. I wish we could go along together. There are a lot of women that are at these functions and I wonder is that the reason why he doesn't invite me. I feel we should be doing things together and since we don't I'm starting to think we are not made for each other. Sometimes I feel like our relationship has no substance.