I would advise myself to be prepared by having a plan and setting goals. Make sure to set short-term and long-term goals to ensure a more effective approach to meeting your ultimate goal. Since we all know that everything doesn't always work out as we plan, it is essential to have a backup plan and a backup plan to that backup plan. In other words, have a plan, set goals, have a plan B and a plan C. We don't plan to fail, but we fail to plan. Life is much eaiser when we prepare and plan.
I would tell myself to make sure to embrace the college life as much as possible. To avoid waiting and holding back against ceratin college experiences that come along once in a life time. There may be some few moments when those experiences might lead to negative outcomes however despite the loss of your own time or some good feeling you may be able to gain something better, something that will lead you to greater things in life.