Anxiety when trying to move on ?

I am having really bad anxiety with moving on from my ex we split up about 4 months ago and iv been trying to move on tried some dating sites etc and that’s fine I’m fine but as soon as the ask to meet up for a drink and that boom anxiety.

I have also tried speaking to people I already know but as soon as it gets more intimate I start with the anxiety and stop everything but I also sometimes scare myself like what if they don’t allow me to stop and back out even though I know them

I am scared and anxious how can I get though this ?

Will I ever be comfortable around someone with our feeling anxious or unsafe ?