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The present is not the past; the past is not the present.
That means past thoughts vanished and the present thought is not the previous thought. That means every act in past lives and now has its own merit. That means the good deed now is not the bad act done before. That means the breath now is not the breath earlier, and the breath felt previously was not the breath sensed presently.
Live with the present. Every act has its own merit, so you should not worry about the past. Just sit with eyes half open, feel your breath now, feel your body breathing now, feel your thought now arising and vanishing. Can you see this interval: while the previous thought vanished and the next thought does not arise yet?
Try to gently stare that interval for all times in a day, or in two days, even when you are lying, sitting, standing and walking. Later, you can use this stare to cut off all wandering thoughts.