Imagine this:

In the same room you've been to for the last few years you can remember, working out with the same dumbells.

The cold, relentless iron talks to you.
It tells you what you're really capable of, when your grandmother calls you an OX because you helped carry her new wardrobe in, or your friends call you the wrist snapper when it comes to arm wrestling..
Only the iron will tell you how strong you are.

Doesn't matter what dumbells you're using, what rack you're using or what bar..
All that matters is what the Animal inside you tells you to do.

The human says to add another 5kg..
The animal tells you to add 7.5kg

You add the 7.5kg, and suddenly you feel that inner animal tearing away, trying to escape, trying to become visible, it's like a transformation, from man to animal, it begs you to keep fighting through that burn, the pain keeps it tearing away at you inside, until it can go no more, and stops. This is when you drop that bar, and your muscles send overwhelming pain signals to your brain.
You bested the human, you became the animal, you curled/squatted/deadlifted/benched 2.5kg more than what the human inside could have done.

The animal inside you rests.

During the weak, after it's mighty battle from yesterday, it is wounded.. Broken, but slowly and surely it repairs itself, stronger and bigger than ever.
You walk back into that room, grip that same bar.
The animal tells you to add another 10kg.

It begins all over again.

Doesn't matter who you are, how old you are, whether you're black, white, asian or whatever.. The iron won't think any less of you, it will guide your path to becoming a beast, first by waking up the animal inside, and beckoning to tear it's way out.

Don't stop because it's starting to hurt, keep going till you can't do anymore, battle the pain, keep the animal inside you fighting as much as you can, never stop believing in yourself, there's an animal in us all, most of us just haven't acknowledged that or woken it yet, never give up, the iron is your friend, but also your enemy, imagine when you're benching? It's your worst enemy, it's trying to crush your chest, so you push it away, the animal inside you however, tells you it wants some more, so you bring the bar back down for round 2, then round 3 and so forth.

Don't let anyone say you can't do it, if they do, prove them wrong. If you can't bench that 100kg, work towards it, it will be you who feels better than the guy who said you couldn't bench it, those who mock someone because they can't do something means they can't do it either.

Believe in yourself.
Never give up.