I like what Vort said.
My thoughts were this: It sounds like you really want to do what's right and are listening to the Spirit of the Lord trying to direct you.
My only worry is that you're doing what everybody does (me included) and following your own will instead of Gods. Please don't be mad at your friends (or bishop) for telling you to repent. I truly believe that if any person were to talk to their Savior he would say "I love you so much, please repent and come follow me". Because we all sin and come short of the glory of God (Romans 3:23) We all have things we have to repent of every day.
I understand your worry about being married in the temple and not having your family there. My mother and I are the only one's in my family who are members. My father is very against the church. I won't lie, it was hard not having most of my family there when my husband and I were married in the temple. But, I believe this is Christ's church that has the fullness of His gospel, not just parts. I believe there are blessings in the temple that strengthen a marriage beyond anything else, that's why the Lord has asked us to be married there. Throughout history when there as been a prophet there has been the commandment for temples. In old Testement times God commanded Moses to have the people come to the tabernacle (temple). He commanded Solomon to build the temple (John 10:23), Nephi was commanded to build the temple (2 Nephi 5:16) and these are just a few of the temples that we know of.
The Church of Jesus Christ of latter-day saints has many doctrines that the world thinks are ridiculous. The only way to know if everything that is taught in the church is true or not is by studying scripture and praying to know if this is His church that contains ALL His gospel. With all of the opposition from my family I thought my testimony was strong, then I went on my mission I talked to many people who manged to shake my testimony. I was sitting in a zone conference with the other missionaries and my mission president said "you can hang your entire testimony on the Book of Mormon". I went home that day and studied the Book of Mormon harder then I ever have. Over the next few weeks, my testimony was strengthened because I know the Book of Mormon is a history of a people that lived on this side of the world. It makes sense to me that a loving Heavenly Father gave His gospel to His children on the Eastern side of the world, why wouldn't He also give His gospel to His children on the Western side of the world. The Book of Mormon teaches and testifies of Christ, it is truth.
If you believe the Book of Mormon is true, then Joseph Smith was a prophet of God. If you believe this is Christ Church then we need to do what others have done... The Lords Will. The Apostle Paul in the New Testament sacrificed everything for Christ, his prestige, comfort, money, and and eventually his life. Even Christ humbled Himself enough to do the will of His Father. The Almighty God, King of Kings was born in a humble stable with the animals and placed in the manger. He suffered ridicule, and the most important thing He suffered for us was in the garden of Gethsemane and on the cross. (Philippians 2:5–8). We have to ask ourselves, what are we willing to do for Him? Are we willing to keep His commandments? Even if it goes against everything we want to do?
If you haven't read all of the Book of Mormon yet then I invite you to do that. Talk with your bishop and get his advice. Bishop's are there to help and support, lead and guide in the Christ-like way that the Lord would have them do. I'll pray for you and the hard decisions you're making. I have a few of my own that I'm working on and trying to figure out. :)