Get ready to study hard and work diligently in all of your pre-pharmacy prerequisites. You will be taking courses such as general biology, human anatomy and physiology, mathematics through calculus and possibly statistics, and let's not forget...chemistry. Oh yea...that's a big one...the big C. Prepare to master and learn as much as you can in chemistry, especially if you don't have a solid chemistry foundation from high school. Chemistry is, by far, the one course you will see for 4 semesters (2 years) as a requirement for pharmacy school. You will be taking two semesters (1 year) of general chemistry and two semesters of organic chemistry.
Considering the extensive coursework and scientific material you will be exposed to, my biggest advice for you is to take all of your coursework seriously. Learn concepts, do not memorize. Look at overall patterns and see the connections between the various courses you will be taking. Realize that the material in one course can surely be applied in others. For example, your knowledge of basic chemistry can and will certainly help you in understanding biology and physiology. Likewise, knowledge of bio will help you in physi.
Most of these courses, especially chemistry, require you to complete problem sets and not regurgitate information on exams like you would in a history or art class. Therefore, the most important thing to do in courses that are mostly problem solving, such as chem and calculus, do the problems the professors assign. In college, professors do not care if you complete the problems they assign because it is up to you to learn. However, you will be unable to master the material without completing problem sets. So, get to that. Other courses, mostly the biological sciences, will consist mostly of reading and understanding concepts about cells, the human body, etc... In these types of courses, you won't have problem sets, but you will have to understand concepts. Try not to memorize.
As for your schedule, try to balance it. Do not take too many difficult courses at once unless you can handle it. Most counselors and even professors say you should not take more than two science courses per semester. Try taking a mix of difficult, moderately difficult, and easy courses. That way you will not burn out. Go to lectures on time and sit in the front row. Follow this last piece of advice very well. Siting in the front row enables you to understand and get a better idea of what the professor is teaching. You will also be less inclined to get distracted like you would if you sit in the back. I always sat in the front row in my courses and it helped me in my interactions with professors.
Don't worry about being afraid of starting a new experience in college. I am starting pharmacy school in about 5 weeks after having been on vacation for almost 8 months and I am apprehensive as well. Just like you, I don't know what to expect in terms of coursework in pharmacy school, challenges, obstacles, new experiences, etc... I know everything I've suggested here is easier said than done and I understand that because I am also in the same position. It's one thing to follow recommendations from someone who is one step above you, but until you haven't been through the experience yourself, it's quite difficult to truly understand what a new academic endeavor is like. People tell me you'll be fine in pharmacy school and this and that, but until I don't go through the experience, it's not that easy to understand. Same thing with you. I can give you this advice about coursework and expectations, but until you don't actually start, you're not going to see exactly what i'm talking about. Your motivation and desire to excel will serve you well.
Good luck to you in college and good luck to me in pharmacy school this fall.