I can't even imagine applying to colleges now. I was applying like three years ago, and from what I hear, its gotten so much harder. I'd try the best I can to help with how to improve your resume, but I had trouble with the same things. I am not the person to ask. The best advice I would give is don't try to give the same answers that everyone you know is giving. If you have something different about yourself to add to a college essay or your resume, add it. Colleges want people who meet requirements, but they appreciate people who just don't give the same canned answers. Obviously don't put anything crazy on your resume, but if you can add something different to your resume, do so.
Regardless of your personalty, I would suggest to attend a smaller college. Even small colleges are a big change from high school in the amount of people at school. Its not like high school where you'll see your buddy every hour and have a chat in the hallway. There are just so many people, even at smaller colleges. College is nothing like high school in schedules, how everything is situated, the environment to socialize. I felt like I knew the faces of just about everyone in my high school and had some idea of who people in my grade and the one above and under me was. I felt very comfortable in my surroundings in high school. I went to a pretty average sized high school in an average sized town. I am in general a pretty boisterous, outgoing person, thats my personality, but in college, just the sheer amount of strangers you will see on a daily basis and interact with will be uncomfortable, and will really individualize things for you and your friends. You don't know everyone around you, you'll begin to narrow your social focus and even outgoing people will feel uncomfortable in situations you wouldn't have encountered in high school.
I'm also not trying to say you'll dislike it. You'll make friends, you'll get into a routine, you'll figure things out, but whether you go to a big or small college, you will feel overwhelmed with the sheer amount of people who you don't know around you on a daily basis and it'll change your interactions. You'll have your friends you made who were originally strangers, but then you'll have to interact with a lot of strangers who you probably won't become friends with, and its nothing besides awkward and difficult. Even if you weren't friends with someone where you lived in high school, you probably knew them. You could have normal conversations without being feeling uncomfortable. Its not a comfortable situation seeing and interacting with so many strangers, but you'll adjust to it. I tend to think that people who come from big cities adjust to that better.
With your school work, 95% of getting good grades will be on you. In high school, there's really a lot of help to do well, its very different in college. In some classes, the only graded work a whole semester is a few tests. A lot of teachers don't take attendance, a lot of them won't get to know you, a lot don't care if you do the work. They'll give you the syllabus, and you'll be expected to follow it, if you want to do well. This is especially true in introductory classes at the beginning of your time in college. I try as much as I can to not take classes with hundreds of people. It really isn't easy. Teachers will get to know you better, help you more, you'll feel more comfortable in smaller classes. It might seem easier to take these big classes where the professor won't be able to check if you attend regularly or if you are regularly doing your work, but I think your grades, work ethic and comfort will really benefit from choosing smaller classes. It's also good to get to know your teachers, you never know when you'll need a reference or maybe you'll get a really good professor, and you can take more of their classes.
I don't know if the things I just said are helpful or just frightening. These are things I'd want someone to have told me my first semester. The first few days you have no clue what you've gotten yourself into, but you'll adapt. Things are very difficult at first, but it gets easier, and you find a routine. I enjoy a lot of aspects, but its stressful. Things matter, you have to work harder. You'll force yourself to work harder, you'll start figuring things out in a number of different areas much better than in high school. High school will seem so trivial. You'll mature. There are probably some people who haven't matured, but almost everyone I know has, and I feel like I have as well.