I am a bit lost

I am in my late twenties and I ve never been in a relationship because I was pretty busy with life I would say , now that i reached my career goals and started to finally notice the people who approach me to engage into something I feel so flustered , anxious and scared that I don't even agree to give them a chance to know them and I feel like garbage afterwards. So any tips to overcome this fear and stop feeling like a weirdo ?