I'm not a good planner

Really, I would like to be one of those girls who pulls out a notebook or something and knows what she's going to do, and when.

However, as hard as I try, my life seems not to want to cooperate with me.

At some point in the month of July I will:
-See the Harry Potter movie
-Hang out with Bekka for her Birthday
-Spend the weekend with my mom
-Spend the weekend with my grandma Pat
-Hang out with Celery
-Finish the giant baby head I've started to paint on my grandma's wall
-Finish painting everything else on my grandma's wall
-Call whatshisface, and hope he doesn't want to date, but instead just hang out
-Stop watching so many medical dramas (house, royal pains, grey's anatomy, etc) when I should be doing something else.
-Burn that mix cd I've been wanting to make since forever
-Go shopping.

First I think, ok, everything's planned! I can finally know what I'm doing without having to freak out about not being able to plan, because something might come up!

Then, SOMETHING COMES UP. My parents need me to do something. A family member's birthday I forgot. Someone died. Someone got pregnant. Stephanie peed her pants so we have to run home and get a change of clothes.

Is it too much to ask to keep everything solid? I feel like I never know what's going on, and I'm constantly going, "Huh? What?"

Maybe it's just me, or maybe it's just life in general. I wonder if anyone else's planning skills are as bad as mine.