It is very important to realize how you perceive things isn't always how things are in real life. Keep this in mind when your MC is dealing with other characters. Don't be afraid to blur the lines a little bit. Just because Winnie thinks Girlfriend #3 is a blonde bimbo doesn't make Girlfriend #3 a blonde bimbo. Remember, it's okay to let your readers make up their own minds. And by no means does your MC have to be right every time. For example...
This is how I think I look like when I work out:
This is what I really look like when I work out:
Get it? Got it? Good.