Each individual, including yourself, will have to decide what is the best way to deal with their situation and feelings.
That being said, I have found that I most often experience self-doubt when I watch movies and TV shows that promote the "monogamous ideal;" they really do present an attractive and convincing case sometimes, but I'm also aware that there's a lot of forced emotions with montages and music, heh. I also experience it a bit when EVERY person I talk to eventually asks if I ever plan to get married, because I think marriage is also presented as something that should be one's "goal" in life.
I don't think that this means everyone's been made into mono-zombies by media; I think monogamy is the right lovestyle for many people. I do wish that those of us its not for weren't always made to question it, though.