dawn on someone, let it slide and more... o que significam? ('cause I'm a man, de Tame Impala)

 Like the brutal morning sun
It dawns on me, what have I done?
Saying sorry ain't as good as saying why
But it buys me a little more time
Lost in the moment for a second time
Each fuck-up that I make, that makes you cry
I'm just pathetic, that's the reason why
In desperation, all that you can do
Is ask me why

Cause I'm a man, woman
Don't always think before I do
Cause I'm a man, woman
That's the only answer I've got for you
Cause I'm a man, woman
Not often proud of what I choose
I'm a human, woman
A greater force I answer to

Once again, as it takes a hold
I am aware I'm not in control
You see, I have a conscience and it's never fooled
But it's prone to be overruled
You wanna know why I always think I'm right?
I can never accept defeat and let it slide
I have no voice if I don't speak my mind
My weakness is the source of all my pride
I'll tell you why

Cause I'm a man, woman
Don't always think before I do
Cause I'm a man, woman
That's the only answer I've got for you
Cause I'm a man, woman
I'll never be as strong as you
I'm a human, human
A greater force I answer to

dawn (up)on someone
to become apparent to someone; [for something] to be suddenly realized by someone; to suddenly understand something

Then it dawned upon me that I was actually going to have the job. 
On the way home, it dawned on me that I had never returned your call, so when I got home I called immediately.
It finally dawned on him that she'd been joking and he was worried for no reason.

fuck-up (offensive) 
An extreme disappointment or someone who continually makes foolish mistakes and doesn't learn.

Dave was a fuck-up. He was constantly ruining good situations for selfish reasons.
Stop making so many fuck-ups and I'll forgive you.

prone to something
likely to [do] something;

My boss is prone to anger when my work isn't done on schedule. 
My sister is prone to sneezing because of her allergies.

let it/things slide
to allow a situation to become slowly worse;

We've really let things slide over the past few months. The accounts are in a terrible state.