Can we ever go back?

Have you guys ever had those times where you were once carefree and happy and u thought it will never end? Then you get new surroundings and in your head you keep thinking that you can go back to the happy times you once had? Then it dawns on you one day that you can never go back to how it was? Well this is what i am currently experiencing. I had always thought i can go back to the good times i had with my friends, but now as i had said it had recently dawned on me and that I can never go back. I will never be able to go back to the times where I would get off school at 3:15 with my friends and go buy food and hang out at our friend's house. No, everything has drastically changed and it can never go back. Those little things that would make me smile without myself knowing i was doing it. It can never come back and those times can never be replaced. All i can do other than just thinking back about what a great time it was is to continue walking down this road that seems to drag on forever and ever, but of course I had learned my lesson no matter how good or bad it is...it can't last forever.