Ok, so in the one to one situations I understand it can feel awkward if the other person is quiet but it is perfectly OK to have pauses in conversations sometimes and I'm sure you are not boring anyone. Is there someone that you enjoy spending one to one time with that you could explain your anxiety to and ask if they will go with you to meet other people in small groups? That way you know there will be at least one person there who will keep the conversation going.
Do you have any options for professional support at the moment especially to look at the specific fears you are getting when interacting with certain people?
I think it is important to try not to avoid social situations all the time if it is something you want to tackle.