“It takes a great deal of bravery to stand up to our enemies, but just as much to stand up to our friends.”-Dumbledore
Personally, I think it’s harder to stand up to friends. These are the people that you value their opinion and have a relationship with, so when you have to speak up if you don’t agree it can be terrifying.
As long as you are speaking up for the right reasons it is worth it. They will see you have their best interest in mind. Be brave and stand up for what you believe in.