If it's not a problem for you now, I wouldn't worry about it as anything more than dissociation that everyone experiences. High school and teen years are very stressful and if you didn't have much support at home, that would make it even more intense. However, if it's a pattern that disrupts your daily life today, then yeah, you would want to see a mh professional to figure out what's going on and how to manage your life with it.