Welcome to our forum.
Yes, many things are possible outside the realm of monogamy. I myself am in an MFM configuration, and I'm doin' fine.
Just out of curiosity, are you still interested in romantic relationships with other women? If so, maybe you will end up in an MFMF configuration (or something on that order).
The main thing to remember is that people have a way of being unique and unpredictable. So I think you will eventually be in a scenario that you find to be wonderful and fulfilling, even if it surprises you in some way.
You're looking into the world of polyamory, and it's a wide, wide world, with so many possibilities. Have patience, learn all you can, and be yourself.
I hope you'll enjoy our site; we've got lots of cool threads to read, and I'm sure you'll have things to post as well.
Glad to have you with us.