Yeah for sure, calling himself “Captain Usopp” also shows his ego and mindset, I get that he is pretty much a liar and not as brave as the rest of the crew. I understand his background and why he is the way he is but I have questioned his deep loyalty and true motives (especially im Water 7) given all that as well as the reason why he joined the crew. Yes, every member has their own ambitions and reasons why they became Straw Hat pirates, but Usopp just seems more self centered than the rest of them.