"I fantasize about going back to high school with the knowledge I have now. I would shine. I would have a good time, I would have a girlfriend. I think that's where a lot of my pain comes from. I think I never had any teenage years to go back to"

This quote by Spalding Gray speaks with the concept of remorse and yearning for a various past. He reveals a desire to return to high school with the knowledge he has now, suggesting that he feels he would have been more successful and had a better experience if he had known then what he understands now. He also points out that he never ever had any teenage years to return to, suggesting that he feels he lost out on something crucial. This quote speaks to the idea that we can't go back and change the past, which we can just progress with the understanding we have now. It also suggests that we should make the most of our present experiences, as we can never return and relive them.