I know what you are thinking "Of course I am going to still talk to all my high school friends once we graduate." "You just didn't keep up with your friends." "I am going to talk to them every day."
Of course, you may be the lucky ones that go on to the same college and university, but if you follow your best friend to college then have you ever thought to yourself. "Did I choose my school based on if my friend(s) would go to college together." Obviously, it could be coincidental that you end up in the same place, but my argument is more on the idea of having friends that go to the same college on your list of important things once you move away.
Now if you are still reading and still in denial with what I am saying then continue.
Since moving away from home I have broadened my horizons and met more people then I could ever have imagined. I have met people that if I have not kept an open mind to them I would not be friends with them now. You will most likely choose the same type of friends that you had in high school if you do not keep an open mind when finding friends in college.
You also do not want to be that person who refuses to make other friends besides their high school friends. I hate to break it to you, but your high school friends will find other friends beside you when they leave for college/university. This time in your life is supposed to be "a new chapter" if you do not branch out of your comfort zone then you will be stuck in a little bubble for the rest of your life.
Not only will your friends in your high school class be making friends, but you need to make friends that are in the same stage of life that you are also in. Still talking to high school aged friends will limit you from conversations due to distance, lack of relevance, and just not going through the same stuff as you.
Sounds daunting? I know.
I am not saying that you can not be friends still with your high school friends. From time to time I catch up with mine to see how the school is going for them, and how they are doing, but I am building and forming relationships with my friends at college because you have had to start up from ground zero, and will be forming a foundation until we graduate.
Even when you have broken it is nice to hang out with your high school friends and talk about the good old days. My point to you is to keep an open mind and to not get upset when high school friends have moved on and found their new friends from school just like you.