leaving behind those memories....

It takes a minute to find a special person, an hour to appreciate them, a day to love them, but it takes forever to forget them....
the more I wanted to forget, the more i remember. A friend asked, if given a chance, would you like to go back to your 19yrs old? Sweet 19, everyone has it, and me too. In my deep heart, of course, I wish to turn back. But knowing the fact that, it's impossible impossible. Regret is already useless at this point. I know so clearly that I NEED TO MOVE ON. I need to move forward, but past memories just kept gushing back bits by bits that had made my days so doomed.....Can someone just tell me how I can stop those memories from overcasting me? How can I leave behind all these and move on.......???