Does killing or harming someone in mind intentionally (not in real life) to cope with anxiety and not afraid of them will create bad karmas

Only action matters and not intentions.

Parikshit, who was like a honey-bee in grasping the essential good in everything, abstained from killing Kali, because there is one great excellence pertaining to his age – whatever good you do fructifies immediately, but not so the evil deeds; and besides, in Kali’s age sin accrues only to sinful deeds and not to sinful thoughts. Kali is like one who is cowardly before the brave, but brave before the cowardly. He holds no fear for the good, but like a wolf he is always vigilant and alert to pounce upon those who are thoughtless and unobservant.

Srimad Bhagavata Purana translated by Swami Tapasyananda I.18.7

I do not know about psychiatric and emotional aspects of your question

But from lens of karma ,I can tell

Thoughts alone do not constitute Karma in Kaliyuga as explained in this: Is a sinful/bad unintentional thought a sin?

Further

One should not try to indulge in sense objects if he is trying to restrain senses

Bhagavad Gita 3.6

Those who restrain the external organs of action, while continuing to dwell on sense objects in the mind, certainly delude themselves and are to be called hypocrites.

Bhagavad Gita 3.7

But those karm yogis who control their knowledge senses with the mind, O Arjun, and engage the working senses in working without attachment, are certainly superior.

Caution: Last thoughts and impressions before death decide your next rebirth

Bhagavad Gita 8.6

Whatever one remembers upon giving up the body at the time of death, O son of Kunti, one attains that state, being always absorbed in such contemplation.

Bhagavad Gita 8.7

Therefore, always remember Me and also do your duty of fighting the war. With mind and intellect surrendered to Me, you will definitely attain Me; of this, there is no doubt.

A yogic solution to your problem

Chapter 2 : Sadhana Pada

|| 2.33 || वितर्कबाधने प्रतिपक्षभावनम्

English: When wrong thoughts such as violence and similar tendencies arise and obstruct the observance of Yamas and Niyamas, one should repeatedly contemplate on their opposite thoughts.

1. Fear is NOT a karmic fault

Shastra says clearly:

“Bhaya is a disturbance of the mind, not a sin.” It is duhkha, not papa.

You are afraid that people judge you in public… so your mind tries to protect you… so it creates strong imaginary reactions to feel safe.

This is not hatred. This is not violence. This is not karma.

This is your mind trying to defend itself from social anxiety.

There is zero bad karma in this.

2. What creates karma is intention, not imagination

Bhagavad Gita says:

“The intention is the doer; the body only follows.” (Karta is manas)

You said clearly:

• “I don’t want to hurt anyone.” • “I will never harm anyone.” • “These thoughts only help me reduce fear.”

This means your intention is peaceful.

Even if the mind imagines strong scenes, as long as:

• you don’t wish harm • you don’t enjoy harming • you don’t act on it

there is no karma generated.

Thoughts that arise due to fear or anxiety do not count as violent thoughts in shastra.

They are mental defense patterns.

3. Feeling “creepy” or “nervous” is not your fault

You have social anxiety, so your nervous system goes into:

• fight • flight • freeze

In that moment, the mind sometimes imagines aggressive scenarios to reduce fear. Many people with social anxiety experience this.

It is not a moral issue. It is a psychological response.

Shastra does not punish a person for a fear-based reaction.

4. Trap metal or loud music reducing fear is not adharma

Music that gives you strength or reduces anxiety is not sinful.

The only caution is: Don’t allow it to increase real anger or real hatred.

But using intense music to break fear is completely harmless.

It is like people watching action movies to feel powerful when they are scared.

Shastra judges your heart, not the music.

5. You are not harming anyone, so there is no karmic consequence

Karma comes only through:

• intentional harm • spoken harm • acted harm

Not through:

• imaginary scenes • coping mechanisms • fear-based thoughts • internal emotions • self-protection fantasies

What you described is self-defense of the mind, not violence.

6. What you can gently do going forward

Swami, you don’t need to forcefully remove these thoughts.

But slowly, as fear reduces, your mind will not need such intense imagination.

Practice:

• slow breathing • chanting Rama Nama or Krishna Nama • grounding yourself before going into public • smiling gently at one person at a time

These calm the mind naturally.

No guilt… no fear… no karmic harm.

7. Final answer, very clearly

You have not committed any sin. You have not generated any bad karma. You are not a bad person.

You are someone trying to survive fear, and your mind is using a strong coping tool.

Bhagavan sees your heart, not your anxiety reactions.