Hi Liam, have you ever been able to speak to a therapist or been to a support group? It sounds like your compulsion to masturbate in public has not only landed you in trouble but could put you at serious risk of harm. Maybe look for a sex therapist in your area who specializes in compulsive masturbation or attend Sex Addicts Anonymous in your area? I hope you are able to find a way towards a healthy sexuality that does not put you at risk of harm. Take care of yourself.