stop thinking about the past

i dont want to forget the past. i have a wonderful past it was fun and exciting and thrilling and everything. but sometimes i sit at home and think about it
liek its okay to think about it once in a while
but i literally go through EVERYTHING that happend. like specificc days i go through everything that happened if it was a good day.
and i want to REMEMBER them,but i dont want to think about them
and if its a friday night and i didnt go out i dont want to sit at home in my room thinking about the friday i had 2 months ago where i had so much fun. i just want to live in the now and have fun and be happy with what im doing now.