Expecting a different outcome from others is what causes resistance in our relationships. When we feel unsettled by something, we can either adjust our expected outcome or the person we're dealing with can change their behavior. So when we're feeling unsettled we should evaluate what need or want is not being met. When we have identified what is wrong, then we can ask ourselves if this is reasonable and if we should request this from the other person, or if we should expect differently in the future.
Some examples of expecting too much might be expecting that you can finish all your work and write a blog post in a couple hours before driving to Pismo, or thinking you can visit with a friend downtown and a different friend uptown in a couple hour window. Some other examples for expecting things from others might be that you will be able to change plans the day of an event with someone or that people who are not as physically able will hike twenty miles in an afternoon.
However, if the people in your life are unable to meet basic needs like intimacy, support, and security, then maybe it should be their behavior that changes. Some examples of this are, someone being unwilling to care for you when you are sick, replying to concerns raised with silence, abuse, and not celebrating your success. If your partner or friends have qualities like these, it should prompt a serious discussion followed by a permanent behavioral change. Giving someone a chance is fine, but remember you have a life to live, and it's never your job to solve other's behavioral patterns.