Wa `alaykum As-Salamu wa Rahmatullahi wa Barakatuh

In the Name of Allah, the All-Merciful, the Mercy-Giving

All praise is due to Allah. Peace and blessings be upon His Messenger Muhammad.

 The fact you feel guilty and you need to expiate for your sin or sins is a good sign. This shows that Allah wants you to come back to Him.

Allah says: “Say: ‘O My servants who have transgressed against your own selves! Despair not of God’s mercy: behold, God forgives all sins – for, verily, He Forgiving, Merciful. And so, turn to your Lord (in repentance) and surrender yourselves unto Him before the suffering [of death and resurrection] comes upon you, for then you will not be saved.” (Az-Zumar 39:53-54)

As for the method of repentance, please refer to the answer linked below:

The Door of Repentance Is Wide Open

Almighty Allah knows best.