Is it normal to catch my face a mirror and think "wow, shit. i'm so ugly."

Depends on my mood. If I'm in a bad mood, I hate the idiot in the mirror and don't want to look at him.

If I'm in a good mood, I don't judge.

If I'm in a very, very good mood, I'll say something stupid like "That's one sexy motherfucker of a man", chuckle and move on.

If I'm in my car, driving past mirrored windows, or reflective shop windows - I'll always take my time to admire my car as it slowly drives by and think "That is one sexy ride, wish I had one", then I look ahead once more, see the star at the front of the hood and smile.
Doing this always cheers me up a bit.

It's the sort of ego-stroking, motivational shit us carguys do.

I have some days where I look at myself in the mirror and think “wow, I actually look good today.” And others where I wonder to myself am I always this ugly

It gets worse the older you get

Body dysmorphia?

It's pretty common since we tend to judge ourselves more harshly than others.

I can remember, as an example that during my teenage years I got lots of attention from the girls my age. I even recall overhearing a conversation where a few agreed that I was the cutest guy at school.

But when I looked in the mirror, all I saw was ugliness. I had brown hair that was kind of long that went from straight and graduating in to red curls. I had what I call a bubblegum nose and green eyes that always seemed too big for the rest of my face. My hair looked like something a gay guy would have but my mother loved it and refused to let me cut it. It all made me hate that damned mirror.

But now when I look at pictures from that time I realise that it was just perception of an insecure teenager and that I didn't look so bad.

I would bet that if you posted pics of yourself somewhere that peoples opinions of your looks would be better than your opinion of yourself.