Lauren you need to try standing up for yourself in small things that do not threaten your job and gradually it will sink into you subconscious that the sky will not fall when you do. When you feel safer you can go onto bigger steps.
Give up now on having everyone like you. It's impossible, some people will like you, some won't, some will just not care. That's normal. Once you know this you will stop trying to get everyone's approval.
If you are submissive to men you will attract domineering men. People who bully others should not be welcome in your life, whether they are male or female. I'm sorry to have to be straight with you but a lot of life is about deciding certain behaviours are just wrong and that you won't accept them. The sooner people know you feel this way the sooner you will attract the right kind of people. I was a JW woman by the way, just so you know.