Artificial intelligent assistant

How to say ,"Stand up for yourself" and "take advantage of" I have a younger friend that I want to use these kind of expressions with, but don't know how to say it in Japanese. I want them to do their best and not have people take advantage of them. I feel they might be the kind of person, that would take negative things from other people to their detriment. So, I want to say something like, you have to stand up for yourself sometimes. If you don't people will take advantage of you. Any ideas?

> You have to stand up for yourself sometimes. If you don't, people will take advantage of you.
>
> You should stand up for yourself and not have people take advantage of you.

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