The part that i can't tolerate with

In my life, i can tolerate with several matters that happen but when comes to group working I can't really tolerate but i have to.In a group, everyone give their best to do their part but sometimes there must be opinion on people's work. This is where we learn and improve but there is one thing that i don't understand. What I should mention and write, i did but turn out people wants to change my work. What i see is no different but they just wanna change it. I have no comment or maybe I don't like people changing my hard work. It makes me no mood to comment or fight back because I admit that I'm not sure with my hard work is correct or wrong until it is examine by the lecturer. Well, what i have to do is keep quiet and let them do whatever they want because they're not doing something wrong also but is just that i don't like people to change my things. That is the reason why i always ask the lecturer can i work alone without owning a group. My bad habit