Q. I cannot control my thoughts. Can Krishna forgive me for having bad
thoughts? What to do to get His forgiveness? I maintain fasting every
Ekadashi as Prabhu says it burns all sins. I want to be spiritual and a good
person, What to do? Please suggest.

A. The nature of the mind is to think.
Thoughts may come and try to overpower, but you should not get carried away.

Keep yourself busy with positive activities.

Lord says in Bhagavad Gita, “Even if someone has committed most sinful action, if he /she is engaged in His devotional service. That person is considered to be saintly.”

If you want to become free from certain difficulties, then help others who are suffering from such difficulties.
Try to create awareness of living a simple and pure life.
It shall help others and you personally.

Try to become positive in all aspects.

You have not lost the battle.

Take complete shelter of the Supreme Lord.
There is nothing impossible for Him.
He is like Sun, wherever there is Sun, darkness cannot remain there.

Whenever such thoughts come, continue chanting little loudly.

Hare Krishna Hare Krishna
Krishna Krishna Hare Hare
Hare Rama Hare Rama
Rama Rama Hare Hare