@Vannotz then don't read it? don't think too much about the chara models (because there's a lot of big tiddy, loli chara in japanese comics) and focus on the plot points, premise, etc
It still baffles me that some people don't understand character developments and forgets that maturity is not always guaranteed with age.
Just go to cheat isekais if you don't want to see the MC being "pathetic"