Without trying to trivialize your reasons for going to therapy: I don't think you have imposter syndrome. If you do, something seems incongruent here. It sound

Without trying to trivialize your reasons for going to therapy: I don't think you have imposter syndrome. If you do, something seems incongruent here. It sounds to me as though you struggle with negotiation due to a lack of confidence. That's not ideal but it can be remedied, and it's a different (better, in my opinion) issue to have. On the other hand I don't really think you can have imposter syndrome while being self-aware about having it. Imposter syndrome is a thought process, not a behavioral pattern. Understanding that you're worth more than what you're charging means you're aware you could improve in negotiation. How would you be aware that you're worth more while also being aware that you believe that you're not worth more? On a more practical note: I used to be a consultant. I initially struggled with negotiation as well. My advice to you is to practice being flippant with the numbers you provide. I know that sounds cavalier and it's easier said than done, but it can be a very empowering (albeit nerve-wracking) experience to learn how to give ridiculous numbers out. You might be surprised how often they're accepted.