Hi myoasis,

There's a very good book called, "When I Say No, I Feel Guilty". It's a book on how to be more assertive. Sometimes part of standing up for ourselves involves learning how to say "No" and not caving in when others want us to say "Yes".

Keep in mind though, that even with better assertiveness skills, you may not always get everything you want. However as long you clearly communicate your needs to other people, and stick to your guns when necessary, you stand a much better chance of reaching a workable compromise without feeling like you were trampled on in the process.