Truthfully, I would go back to about 17. I would have been a lot more laid back. I was a serious teenager. I took life seriously. I worked a lot. I didnt take the time to enjoy myself. I didnt Party. I was ready to be an adult too soon. Responsible. I lived like an adult rather than a young adult and I should have had more fun.. Now, I feel like I missed something and I can never go back. . Ever hear that saying "if I knew then what I know now?" well, that applies. If I knew I had a lifetime of seriousness and responsibility, I would have had more fun back then.