"If God is just, shouldn't life be fair?"
The Bible tells us about a good God whose mercies for mankind are new everyday; who sent His Son as a Saviour to pay for our sins with His own blood; who gifts us with talents and opportunities for His own wise purposes, according to His plans (not ours). Our God is very gracious, but that also means that if we're comparing situations from our own human perspectives, life is definitely not "fair". The question for us as His people is whether we will be faithful with what God has given us, and will we be faithful to Him?