I’m lazy and wishy-washy.
I am unable to immediatly be perfect at whatever it is I am trying to do, and I have to learn things; I am not omnicient.
…Or that I sometimes truly believe that the above is a personal failing. One or the other.
(And I think too much.)
Is this not true for everyone? Maybe your primary shortfall is being too hard on yourself. Perfection requires time and proper practice.
As for me, I have an assorment of minor shortfalls and none of them to me really stand out above the the others. I am a little too bitchy sometimes; I procrastinate a little too much now and then, I should smile more; I should speak more clearly and make better eye contact while speaking to groups; I use cuss words too often.
I avoid conflict because I am no good at fighting - I don’t know how to fight. I’m also too good at holding grief and anger at arm’s length so that I don’t feel the pain. This can’t be good, but if I let the grief in, I get practically suicidally depressed. There’s no good choice there.
My rusty and largely useless self-starting mechanism, which might work about one day a month. The rest of the time it’s like pushing myself uphill with the hand brake on.
I’m to self-conscious and very much a perfectionist. Both of these things keep me from doing new things because I’m sure I’ll screw it up.
A lack of self motivation, and a lack of compassion for folk other than myself.
That’s what I was attempting to convey with the second bit; clearly, it made more sense inside my head. 
Well put. I spend many days lying at the bottom of the hill feeling guilty.
I fall deeply in a kind of short-term lust very easily.
I have little willpower.
(BTW - Bad combination there, ok?)
I’m lazy.
I’m kinda fat and can’t run for shit.