From a Jain perspective, eating chicken is against ahimsa because it involves violence to living beings.

If you have eaten it, you are not “bad”, but you should:

• feel sincere repentance
• do alochana / pratikraman according to your practice
• resolve not to repeat it
• move forward with greater care for ahimsa

If it was done unknowingly or under pressure, Jain tradition emphasizes repentance and restraint, not despair.

Be शांत, repent sincerely, and return to the path of अहिंसा.