How can I get mutual divorce? what are the process to file petition?

Will it be legal to marry a girl born on 4.8.2002 Because someone is telling she is 18 and major. My age is more than 25. Please advice

Wether police has to maintain any record for counselling undertaken by them in case of 498a& 406

I have married in 2018 March after marriage I got pregnant with in April 2018 ,in between my father got heart attack he was no more now my husband sent to my home in 3rd month of my pregnancy after he wasn't given medical expenses to me if he gave just 2-3 which was not enough for my medical expenses during pregnancy when I asked him about the salary sometimes he used to I have paid for loans and sometimes for court lawyers why because my mother in law is second wife of my father in law so first wife son filed case for getting job of father in law so this court case was running at that time so my husband totally ignored me during my pregnancy even during he came to see me only for 6 times during my delivery also he said to something for not coming to delivery just because he feared of paying my medical bills and now today my baby is 10 months old we still have disputes with his behavior he always takes money from his mother stating that I have to pay my wife credit card bills but he is not paying my bills he made his credit card bills n loan payments which are his payments by taking money saying my name now we had a discussion 20 days back so I came back to my home with my home in this 20 days he harrased mentally sexually and he haven't looked after my baby in this 20 days now he is saying that he won't give me any expenses if I stay in my parents home my father can't help me all the time as he is a pensioner today he threatened that he will come and beat me if I say anything to his sister what to do now