One of the things you can do is go to
vocations.com. They set up discernment weekends for women considering religious life.
I will need to find the link for you. There is a order in New Jersey that provides a year’s formation. During that year, they help young women like yourself discover which order would be the best or if you actually have a religious vocation.
When I was young, I thought I wanted to be a nun. I had the wrong reason. I mailed various convents for information. When my mother found out what I was doing, she took me to talk to the chaplain (my father was in the Army).
The first thing I would suggest is that you speak to your parents and let them know about your desire to devote your life to God in this way. I only know of one Carmelite convent that will take women as young as 18 y/o. When I was young, there were still a few places that would take young ladies as young as 14 y/o.
Most convents (or monasteries, the more up-to-date term) require a woman to be 21 y/o… The upper age limit is generally 45 (instead of 30y/o as it was when I was younger).
The most important thing you can do is keep the matter in prayer and definitely speak to your parents.
I know this information because a few years ago, I had an unexpected “nun thought.” Even though I now have the right reason, impediments that I cannot remove stand in my way.
