Lots of prayer and spiritual direction. When I was little, I played Priest in my living room and said mass. Also had lots of actual Priests and lay people tell me I’d be a priest someday when I was younger. These are strong signs of a possible vocation from someone at an early age. Last year I seriously looked into applying to Seminary and the priesthood but after praying about it a ton, I decided that maybe it wasn’t what God was calling me to do, or at least not at that time. So I’ve been discerning a possible call to married life over the past year and a half.
Time and prayer will tell what I am called to, same for you. But we also have free will so if I am called to the Priesthood I could still say no and get married, I just wouldn’t be ultimately as happy as I could of been but would still be happy. Same if it was reversed. And same for you. We want to follow what God wants, not what we want but we do also have free will. It’s not a sin to reject a calling because all vocations are holy