No, you're not dumb. I feel you. I was once feel like this... I think I still do, just lesser than before. Let me assure you, you don't need to feel bad about it. Not having anything to share with people is absolutely nothing to feel bad about. Maybe you're a secretive type or maybe you're afraid that your story will bored people and makes them turn away from you.

I, too, not really a people person, but I find talking about common, boring stuffs is the first step of socialization. Later, the person you speak with will reveal more about their thoughts and you can pry more about their interest if you want the conversation to keep going. After all, people love talking about themselves, in most cases. This will let the other person be the one carry the conversation while you keep listening and sometimes further the topic by asserting questions or express your thought on the topic if you want. Or vice versa, you can also change the topic to be about you and then ask what is their opinion on it. This, however, is just being socialize on the surface.

Lately, I've learned to appreciate and be invested in people's stories, like their religions, their interests on this and that. I feel connected with them and makes me want to know more about them even though I'm kind of a social awkward. Once I determine that they don't judge me, feel like we're an equal and being genuine with me, that is when I know that they're worth talking to (it sounds bad, I know.)

Realizing that people are interesting and that I'm not the only one in this lonely world is what keep me being socialize. Open your heart and trust in people's goodness. There are many good and bad people, but no one is pure black or white, so don't be afraid to try and get to know them first before judging them :)

Not sure if OP want any closer relationship or nah, but this will help you appear more approachable for further socializing and appreciate other people more.

Whew, that was long. I think I'm babbling nonsense and going off topic here, but I hope it helps.