I definitely wouldn't worry about it too much! I write with my left hand, but sign right hand dominant. Deaf people can still understand the signs (as long as you're making them clear) whether it's left handed or right handed signing. I would try to practice one dominant hand though, as it makes learning a little easier so you know which hand you need to use in conversation.
Just go with what feels the most comfortable for you to use, and you'll gradually stick to one hand dominant. It's what I had to do! And I still use my left hand for certain signs when I shouldn't lol
Really hope this helped you ☺️