Past is gone and cannot be changed. Future has not arrived, therefore we can't worry about it. The present moment is here and it's up to us whether to waste it or make full use of it in accordance to Gurmat.
It's our Paaps done in the past and currently, that separate us from Vaheguru jee. Bhagat Ravidaas jee in a very beautiful Shabad has requested Vaheguru jee to ignore his paaps and even suggested that there is one good thing about his paaps - that Vaheguru jee has got the name "Patit Paavan" because of our Paaps.
ਜਉ ਪੈ ਹਮ ਨ ਪਾਪ ਕਰੰਤਾ ਅਹੇ ਅਨੰਤਾ ॥ ਪਤਿਤ ਪਾਵਨ ਨਾਮੁ ਕੈਸੇ ਹੁੰਤਾ ॥੧॥
(If we had not done Paaps, O Anant Vaheguru, how you would have got the name - Patit-Paavan).
Patit means sinner Patit-Paavan means one who cleans or redeems or delivers a sinner.
The message of this Shabad is not that we should continue to do Paaps but this Shabad is making a plea to Vaheguru jee - It's true Vaheguru jee that we have done countless Paaps in the past but we are now feeling remorse for the same and your name O Vaheguru jee is Patit-Paavan; so do your duty of delivering us sinners.
In any case, Bhagats had such informal relationship with Vaheguru jee that they could say such things to Him. Such Avastha comes with intense Kamaaee of Naam and Gurbani.