One mistake I learned to avoid was stressing over the little things. College is a time for you to grow and you're not going to know everything. You have to be able to take a step back see what you can do and find help if you need it. Another was staying in a field you have no interest in and not being involved in clubs and activities that do interest you. Join the classes you like and the clubs that make you happy and make connections through those. Take advantage of every opportunity that will get you one step closer to your dream life. College is only as successful as you make it.