Avoiding people and situations just because of your intrusive thoughts is unhealthy and giving the obsessive thoughts/ intrusive thoughts more power. You deserve to feel more power over them by being able to say "that's an intrusive thought and it has no power over me," rather than letting it terrify you so much that it changes your behaviors and interactions with others. You deserve to have friendships and closer relationships. I wouldn't stop seeing your therapist. This is something you need to discuss with him/her, even if you don't say you had an intrusive thought about him/her, just talking about how it makes you change who you spend your time with. Avoidance is something that just makes OCD worse. Good luck!!

By the way, are you seeing a psychiatrist? Are you taking medication? I know medication can't fix OCD completely, but that might be another option to try. Best wishes!