A bedouin asked the Messenger of Allah (sal Allahu alaihi wa sallam): “I'd like my sins to be very few.”
The Messenger of Allah (sal Allahu alaihi wa sallam) replied: “If you seek the forgiveness of Allah as much as you can, your sins will be very few.” [Related by Imam Ahmad Ibn Hanbal]

Repentance erases sins as though they had never occurred.

So feel guilty for your excesses: Regret has to occur in one of two places; either this world or the next. Better now than on the Day that for many will be The Day of Remorse and Regret (Yaum al-Hasara).