The curse of Cain, being black skin, is a Mormon teaching only and not taught in Christianity, nor being in the Bible.
Genesis 4:6,7 (KJV)
6 And the Lord said unto Cain, Why art thou wroth? and why is thy countenance fallen?
7 If thou doest well, shalt thou not be accepted? and if thou doest not well, sin lieth at the door. And unto thee shall be his desire, and thou shalt rule over him.
A lot of people allow jealousy and anger to eat at them for days. If not taken care of with God, then bad things happen.
I hope you have learned from Cain’s mistake, in order to know how to respond to doing God’s will, even when other people may be producing more fruit.
When we walk worthy in the sight of God we are able to wield off the fiery darts of the evil one. Temptation has no power over us for the Lord is with us.
When we follow the Lord’s will instead of our own many great things will take place. We will become honest and true amongst others.
Be found selfless before the Lord. Offer up your time to Him. Make more time in your daily life for Godly things. Share His gospel with others.