[piercehawkeye45]

First of all, congratulations on graduating.

Second, I would say there is nothing wrong with being a private person unless it is obviously affecting your ability to make and hold onto friends. It is perfectly possible that you just relate better with your high school friends and therefore you trust them more. I myself can be very private with people I am not comfortable with too. But it is fine assuming that you could open up to people in the future.

But, from the way you worded it, it seems that you are having trouble opening up to anyone that you have not opened up to before. Maybe you got hurt by someone you thought you could trust and now you only feel comfortable opening up to people you know won't hurt you? Either way, its not a huge issue, but if it is bothering you I would try to do some self-reflection and attempt to figure out why you have trouble opening up to people you have never opened up to before.

Remember, situations and people can change pretty quickly. Now is about the time where more and more of your friends will get time consuming careers and into serious relationships and maybe even get married and eventually have kids. While I know people who are still good friends with their now married high school friends, there are also others that have lost contact as well. If it makes you happy, stay closest to your high school friends, there is nothing wrong with that, but I would recommend not being dependent on them as the only people you can ever open up too.