Rumi is a recessive Alpha, meaning she's an Alpha but with weaker pheromones than a full one, one of her parents being a beta. She's less dominant and more awkward than full Alphas. Recessive Alphas are almost as dominant as dominant alphas however they are less controlling and give off less intimidating pheromones. 
Her two best friends, Mira and Zoey are also part of the omegaverse. Zoey is an Omega, whereas Mira is a Trans Alpha born as a Beta.
Rumi fell for you. You're an Omega.