<human>: Summarize the given text in a few sentences.

So, I'm engaged to a wonderful guy that I've known since I was very young. He's truly great, really good to me, and wants to marry me and be amazing to me. I love him, our relationship is good.
But, here's the thing- He's had really great examples of marriage and relationships in his life. His parents are happy, other couples he knows are happy.
I, on the other hand, cannot think of a single relationship or married couple I know that is happy. My parents yell at each other quite a bit, my aunt got cheated on by her first husband and now has a not very good second one, etc. etc. etc. It goes on.
I've never ever considered getting married until my SO came into the picture. It sounds nice with him, and I was confident we'd be different, that we'd work.
Recently, I've been starting to doubt again that marriage EVER works out. In my mind, from MY personal experience, it only leads to the couple hating each other, or growing tired of each other, and I've heard that kids only make it worse.
Everyone I've talked to, even when people were congratulating me on my engagement, ALWAYS had to throw in how hard marriage is, how hard you have to work at it, how it's not always a picnic. None of these people EVER could tell me it was worth it, though. I know it's hard work, but isn't it WORTH IT? Can you not tell me, "Yeah, it can be difficult, but I LOVE IT,"? That you're happy?
A friend of mine even asked me, "Uhh, you sure you want to get married?" like an asshole. No one can tell me anything good about marriage.
I just need someone to tell me that they're happy in their marriage, that they truly wouldn't change it if they could.  Can anyone just tell me anything positive about it? Because I'm really starting to lose hope.
<bot>: My relationship with my fiance is great, but due to my lack of examples of good marriages, and only having examples of bad ones, I'm losing my hope that marriage works.