Ladies, could you give me some advice?

since you said you were going off to college in the fall, that's a good chance for you to meet new girls, there are a lot more girls at college than in high school and they will be girls that you don't know so you'll have new friends! from the things you wrote, you don't seem like a bad guy, just become a bit more adventurous and impulsive! but yeah don't worry, once you get into college and meeting new girls you will have a girlfriend in no time!