OP, you'll have to realize you're growing apart from them. If you don't feel any different, then perhaps they're growing apart from you. For the past 4 years, since you've been out of high school, this has been happening. They're progressing, as NTs naturally do, almost like they're automated to do so, and they see you're out-of-step.
I know it's hard, the fact that you still have your high school friends shows how hard it is for you to make new friends. Ideally, everything would be wonderful between you and them as it once was.
In reality, this isn't going to happen. It's over, things have changed, and you can't undo them. You have to choices: become the outcast tag-along friend who they no longer respect, or realize it's over and cut them loose, or at the very least keep them at arm's length.