College will be different than high school because you will be treated as an adult. If you choose to skip class, to hand in papers late, or to blow off assignments all together, there will be consequences. However, unlike in high school, these consequences will be reflected solely in your grade. In other words, your professor is not going to call anybody to tell them that you are skipping school.
In addition to being treated as an adult, you will be expected to act like one. Email your professors if you accidentally miss class or if you know you are going to miss a class. If you find that you are having trouble in a class, let the professor know. They are normally more than willing to meet with you to help you.
College will also be different because your time will not be structured for you. You can choose your schedule and you will have a lot of time in-between and after classes that will be unstructured. It will be up to you to manage your time.
The key to success is being able to balance your schoolwork and your social time, especially now that you won’t have anyone telling you that you have to do your work. It is a good idea to get involved in some clubs, the more involved you are, the less isolated you will feel. Community service clubs in particular are a good idea, because they will look excellent on your resume.
Also, there are plenty of academic support services available to you but you will need to contact them yourself. If you don’t let anybody know that you need help, you are likely not to receive it. However, if you speak up, there are excellent services available to you for free.