One of the happiest days of your life is when you get to stand in front of of your friends and family and say the words, "I do" to the love of your life. You get to look like a princess and finally after a long time, you get to have your prince, but without all of the controlling parent stuff that goes with it.
Many people will tell you when to get married. They will tell you that getting married after college is the best thing to do, so you can have everything started in life and you'll be good to go. However, I feel that big moments in your life shouldn't be planned according to the people that surround you. Our lives are far too short to live by others and waste away years that we have during that college time to wait to get married.
In the end, this life is the only one you get. You get to decided on many, many things and I firmly believe that marriage is one of them. Whether that is as soon as you're out of high school, or when you start college, or even ten years after you started your occupation. The happiest day of your life should be decided by you. Not your parents, not your grandparents, not your friends. It's all up to you, and when you're ready for that commitment.
Likewise, if you're someone that has a different goal in mind when to get married, I kindly ask you to not crush your friends on when they are ready for that step in their life. Regardless if they are too young in your eyes because in the end they are them, and you are you. Only you can decide when you're ready, and if that may be now or later, it will always be your choice. That being said, enjoy your special day, I hope that it will be as magical as you have dreamed it would be, and I pray that all things fall calmly into your hands.