Steel is unfair... Our bronze weapons can't stand up to their weapons...
Gunpowder is unfair... It costs a lot to train my knights and any peasant can shoot them with 10 minutes of training...
The loom is unfair... It can make fabric faster than me.... And I don't have enough money to buy one
The oil industry is unfair... I'd have to go out in the hot sun and dig a well...

I'll just stop now...and say...

Life isn't fair... There is always someone better, faster, stronger, smarter, more capitalized, etc, etc than you... Work hard and be creative... And don't be afraid to fail, it's the only time you actually learn anything.

Or you can just tell your friends to grow up