Confused about getting married

My fiance and I have been in a relationship for 6 years. The first 3 years of our relationship was rocky. During the first 1 1/2 years we dated, he cheated on me. He continuously lied about it and eventually convinced me that he was going to stop. I gave him a second chance. Trust was a big issue after that. I didn't trust what he did or said to me... it took about another 1 1/2 before things were turning for the better. We lived together for one year and we were happy. He then decided that he wanted to experience living on his own since he's always lived with a roommate. We did a year of long distance before I decided to move with him. He proposed to me after 6 mos of doing long distance. I didn't know what to think... I said yes but I was hesitant. I'm still confused to this day after 1 year of being engaged. My family members aren't too fond of him since they know what he's done in the past. It's hard for me to be happy while my family members aren't truly happy for me. They said that he's not the one for me. My heart is shaking because I dont know if he's the one for me. I am terrified... I am lost. I still don't completely trust him since there have been times when he'd say things just to make things "better" and it's not the truth. I love him so much. He's my first love but with all of these factors above it's hard to know what to do. Sigh... what do I do??? Sincerely, Confused and heartbroken