No one likes to be manipulated or used. Sometimes you may find that others will manipulate you via dishonesty, empty promises, guilt and other methods to get what they want without consideration of what you need, think, or desire. When this first happens, you may be unaware, but as the negative feelings arise related to repetitive manipulation, you'll begin to realize that you are being manipulated, and that doesn't feel goo.
You can change the course of manipulation, but creating clear boundaries and knowing what's right and good in situations rather than just going along with what others prescribe or plan. Onward.