[paskozdilar]

Regret serves a purpose - it makes things memorable and makes them affect your decision-making. If you regret wasting time on pointless things, hold onto that regret and use it as a driving force to work now and in the future. That's the proper way to cope with regret.

In an alternative universe where you don't feel that regret, you could probably keep wasting time for the rest of your life without ever noticing.