I’m insecure: help

When i meet a guy and they don’t know much about me I’m super confident but once they start to know more my facade starts to break(i feel), they’re gonna see how emotional i am of how weird i am and i start like overthinking everything i say and if I’m fun to them or not. I don’t think any of it is showing but i met this guy and we mesh great we can talk we joke, but i get so nervous. I did open up to him about some of the stuff that’s happened to me and it felt weird I’ve had shit experiences. I realized the issue is me, I’m really insecure. We talked about how I’m not ready to start anything serious but I’d love to get to know him and vice versa! No sex! How can i get better? I feel afraid bc i want to put myself out there but it’s scary so it’s easier to be alone :( any tips?