Welcome to the forum
I highly sympathize with your situation. I too was in a similar predicament when I converted to Orthodoxy against the wishes of my Protestant family. Moving on, I think that a good thing to remind you is that converting just because it 'feels good' is not necessarily a good reason. Our passions and feelings can misguide us, especially when it comes to doing what 'feels right'. Feelings have to take a backseat to reason and logic. And this is why I would urge you to read up and try to learn about the Orthodox Church first before converting, because your feelings could completely change just as soon as they came to you. They are not a firm foundation to place your faith on.
That being said, I won't lie to you, converting to a different religion from your family and associates is VERY difficult. It took quite a while for my parents to accept and tolerate the fact that I was leaving Protestantism behind, and led to many clashes in our household and uncomfortable situations. Likewise, I even became estranged to many of my friends. I think that perhaps the worst of it all is the fact that I have no one to go to for religious advice or counseling other than my Priest and the fellows at my Church, since no one in my family and no one among my friends are Orthodox. It's tough, you have odd situations like when religion is brought up in the family room or on the kitchen table and you are asked a question, and your answer offends those in the room, or when they ask you to pray with them and they feel weirded out when you pray Orthodox style. But you know what? Despite all of this, I feel no regret for my conversion. It all still works out and Orthodoxy is perhaps the one diamond in my life that gives me a sense of purpose.
I won't lie to you, your situation probably IS going to be very difficult; in fact, it may be even more difficult than it was for me, since Mormons are generally known to be pretty dogmatic and clan-like with their family and religion. But in the end, I would still urge you to do what you think is right in the end and hold fast to the truth that is within Orthodoxy if you happen to convert--which I hope that you do.