I think I sit high in the scale of agreeableness, and this isn’t always a good thing. I find it really hard to say no to people a lot of the time, and sometimes I don’t let my true opinion out for fear of offending someone.

Not letting your true opinion out is a recipe for disaster. It’s an easy way for you to be pushed over, and may lead to resentment. Best to stand firm over your beliefs, even if it means discomfort in having to say no, and even if it means offending people. It’s ok you know, they’re just getting their feelings hurt, it’s part of being human!