Frustrations

I'm wondering if frustrations are tied directly to expectations. I live the majority of my days in a frustrated mode. Partially because of the stage of life I'm in with child rearing. But also, I think it's because of the things I expect. You see I have a dangling carrot in front of me. It's that life will get easier when.....

....the children are out of diapers
....I'm not scheduling around naps
....we can all eat the same food-no baby food this, toddler food that
....they sleep through the night
....I'm no longer in transition
....I don't have to buckle all three in seatbelts.

Well, here's how I know that is flawed thinking. I am past ALL of those. And now, theres a whole different list. A list that is pointless in writing out simply because I've learned that "life will get easier" is the part that is wrong. Whoever said it would be easy? Why do we assume it should be easy? So, in understanding this, I still struggle with the acceptance of it and therefore, I live in frustration.
I mentioned the dangling carrot. I refer to this a lot when things don't happen that I think will happen. A bike ride. A Girls Night Out. A date night. A day off. A vacation. I'm holding on until this "carrot" happens. When that carrot is taken away, I'm left with frustration.
I guess now I'm trying to find out how to not sin in my frustration. I so want to be more easy-going. I want to handle disappointment well!