Am I Too Young To Get Married?

My best friend and I are in love. We have been best friends for four years now and I can`t imagine life without him. I know his love for me is not just hormones and I know he wouldn`t go after another girl. We have talked about marriage and I think he is planning on proposing after graduation this year. I just don`t know if I have enough wisdom (like the kind you get from life experiences) to be married. I have also heard a lot about needing emotional maturity to be married, but, if we don`t have it now, we`re willing to grow it together.
PS I know that I have my whole life ahead of me and I`m thinking about that too. I just need help with the wisdom and emotional maturity part.
Thank you for your help.