I wish I had understood this truth when I was younger. And unfortunately, you can't go back to the past and pass your knowledge and experience on to your younger self...
But you can pass your knowledge on to your children; help them to know what you wish you had known, teach them what you wish someone had taken the time to teach you.
The greatest thing I can be is a loving mother to my children. To teach them about Heavenly Father, His Plan for us, to teach them of their worth so they know that they are divine children of God.