Account is recoverd by a person

Hello, My gmail is recovered by a person and it contain my personal data and i want to recover my gmail and i am very big fan of google and this why i make my account on google and trust on google and also use android devices so i want that i recover my gmail account and problem is that i forget some questions to recover it and the person who recover that account also change the recovery gmail and also recovery phone number so please get my gmail account back i really very thankful to google for this help