How can one reconcile the abundance of good deeds with feelings of guilt, lack of devotion in prayer, and sending a friend request to a girl from a fake account to test her?

Do not despair of the mercy of Allah, but rather repent to Him, for He, Glory be to Him, is Forgiving and Merciful, extending His hand for the wrongdoer to repent. Increase in righteous deeds, for good deeds erase bad deeds. If your repentance is sincere, Allah will erase the sin from you, for the one who repents from a sin is like one who has no sin. Strive to attain the causes of solemnity (khushu') in prayer, and if you are afflicted with obsessive whispers (waswasah), do not pay attention to them and turn away from them.