Is My Past a Barrier to a Blessed Marriage?

Assalamu alaikum. My mind has pulled me into a deep, dark pit that feels impossible to escape. I shared past mistakes with the man I love because he wanted full honesty before nikah. Those mistakes happened when I was in a very low mental state. Since then, I've been having anxiety, nightmares, and flashbacks. After he asked his questions, it's like my past was dug up, and I haven't felt emotionally safe since. First, I'm not blaming anyone else for my choices. I own them. But I was in a really dark place then. I lacked family and friend support, felt so alone, and I wasn't who I am today. I never committed zina, but I still feel like what I did is a huge weight I carry everywhere. The strangest and saddest part is that I have truly changed and made tawbah. I feel like I turned my life around completely. I left that old version of me behind. I returned to Allah. My deen became the center of my life. I pray, make dua, work on my character, try to be someone Allah is pleased with. I know I'm human and still slip, but deep down, I'm not the same person. But my mind won't let me believe that. The man I love is trying to process everything. He hasn't been cruel, and I get that he has emotions too. But hearing him say it's normal for him to struggle, that many men would feel the same, that some would even leave... it shattered me. Because all I heard was: "You're the kind of person people abandon." I know he probably didn't mean it that way. He was just being honest about his own feelings. But those words stuck. Now I can't look at another Muslimah without comparing myself. I see sisters everywhere, women I used to know, people getting married or engaged, and my mind attacks me instantly. "She's better than you." "She deserves it more." "She has a better family." "She doesn't have your baggage." "Of course someone would pick her." I know it's unfair. I know I don't know their lives. Everyone has hidden struggles. But my mind has convinced me that everyone else is worthy of love except me. I'm terrified that if things don't work out with him, no one will ever choose me. I keep thinking, why would anyone choose someone with a past when they could have someone without one like mine? I believe Allah forgives sincere repentance. I truly do. But I struggle to believe that people can forgive me too. I feel like I've spent so much time trying to become better, but one part of my past has swallowed my whole identity. Will I be seen that way by him or any future spouse forever? I don't feel like someone who made mistakes anymore. I feel like I am the mistake. I've started isolating myself from everyone because I feel like a burden. I don't want anyone to have to accept something so difficult about me. I don't want anyone to feel like they settled. No one can see me for who I am now and who I'll be in the future. I cry so much because I feel like I'm mourning a future that I don't even know if I lost. I miss who I was before I told him. I miss being able to see other women and just admire them instead of feeling threatened. I miss feeling hopeful. Has anyone else ever felt this way after truly changing and repenting? How do you stop feeling like your past has stolen your future forever?