It can be difficult for “new” writers to create flawed protagonists, mainly because we want them to be the “good guys”.
Certainly, you may continue writing as you wish. However, you did get some constructive criticism there. After you write a story, set it aside. Read some stories by other writers. After a while, re-read your story and see if there’s anything you’d like to change.
Naturally, introducing a flaw in your protagonist will change the progression of the story. It may even change the ending.
That’s okay. In fact, you’ll probably find it an improvement, and so will your friends.
Keep on writing!