Honestly, I just use a lot of logic to fight against my thoughts. When I think someone has an ulterior motive then what could it possibly even be and why, do they actually have time to mess with me, etc. Sometimes I don't feel any better but my brain understands it's also nonsense, and it takes a lot of effort and practice - it won't always be easy or make you feel better. It also helps to remember that you're not the only one feeling awkward or uncomfortable in a lot of conversations.
Don't feel bad for not taking pictures of your face and don't feel pressured to do so online. It's better for you in the long-run to not have your face out there anyway.
If you have trouble talking about this verbally with your therapy, writing them a letter or note explaining it will also do! Even if it seems awkward if they have to sit and read it in front of you, you're making an effort to address your problems.