Hello Petal !!
I can really relate to what you shared. I have been in the closet and have just recently come out to myself as being polyamorous. It might not take you as long as you might imagine to adjust. Some people do take longer to make changes and shifts, so I guess it depends on your ability to move forward on a personal awareness. For me, it was just under the surface and all I had to do was acknowledge it consciously and that was it.....I'm living it now and very comfortable with it. Life will unfold and I will have to struggle with the relationship dynamics as they come up, but I feel completly ready for that. So....I hope you have an easy adjustment !!!
The key to life is in being fully engaged and peacefully detached simultaneously and authentically in each moment.