Do extreme mental stress and all the time having a feeling of extreme guilt(which makes difficult to concentrate anywhere) in teenage and young age for several years affect brain growth,memory, concentration or damage brain in any way?

Stress: can increase any physical or emotional symptom. Please consult a mental health profession to learn to manage your stress better. A prudent spiritual leader might also be helpful but avoid anyone who judges or purposely makes you feel guilty. We all make mistakes but life has many new beginnings and this can be one for you. Peace and good health. How is your diet and exercise level? Sleep?