I've had a number of relationships in my life, some mono, some poly. So far, my relationship with my married girlfriend Gia is the longest lasting, at 3.5 years and counting.
Imagine if you were a young teen entering the dating world for the first time and asking us if traditional dating can work. Yes, it can. Does that mean your particular relationship will last forever? Well, frankly, no, most don't, especially not first relationships. But you have a shot, same as anybody. People often say variations on "Poly is Relationships 201," meaning you already need to have a strong grasp on the fundamentals of relationships... honesty, communication, respect, time management, etc... if you want to succeed at this more complex version of it. Something to keep in mind. In the end, experience is the best teacher.
Best of luck!
Me, 30ish bi female, been doing solo poly for roughly 5 years. Gia, Clay, and Pike, my partners. Davis, ex/friend/"it's complicated." Eric, Gia's husband. Bee, Gia and Eric's toddler.