As others have said, you definitely need a lawyer.
My parents got an annulment, more than 30 years after they were married! But, it was a religious annulment from the Catholic church. They had obtained a legal divorce 10 years before that, and my mother felt she couldn't get married again without annulling her 18 year marriage.
I would talk to a divorce lawyer (as I'm assuming that's who handles these things) or if you only want a church annulment (which can take between a few months to several years depending on the "Plan" you choose (aka, the amount of money "donated" to the Catholic Church. My parents had some money, so theirs went through quickly, I had a friend who did this who had little money and it took 2 years.) But, with a Church Annulment only, in most states you are still legally married and need to obtain either a legal divorce or legal annulment.
If you got married Catholic, you'd need to talk to the priest or pastor in the Church who married you, if possible. If not, you'll have to go to someone in the Diocese. But, then a legal divorce or annulment would still be necessary, religious annulments are not a legal dissolving of marriage, although legal
secular annulments are legally the same as divorce, meaning you are free and clear of the marriage.