I found my child to be submissive/pleasing in front of elder kids ( while playing basketball he will pass basketball to them more often and will not be aggressive at all) and giving up with classmates if they are too dominating. He will stop putting his efforts ie during group presentation and group activities like that. I tried telling him multiple times but his arguments for elder kids is - they will not let him play with them and for classmates- whats the point if they don't listen.
I have tried convincing him not to give up and be aggressive but doesn't work. I am thinking if few autobiographies/books on similar theme might help, so here I am looking for those. Thanks for your help.