I'm drifting away from the people closest to me

I really like 2 people, and I am so confused because how is it possible to like 2 people at once? I have been worrying about it which has caused me to argue with the both of them and drift away. I don't know what to do because I can choose. I can't concentrate on work, I have major mood swings and I feel like I'm going to loose both of them, please help me!