Stretch marks 😭

Im not pregnant but growing up I’ve been thick not really over weight but ever since I started dating my boyfriend I’ve gained weight gained and lose but I’m really sad because new stretch marks are appearing on my belly like the front and I’m so gross out and sad about I used to love them because they were part of me but now I’m feeling gross because their in the middle of my belly and my boyfriend is trying to make me feel better but I hate myself so much Rn for letting myself go what can I do to remove them ? Anyone else go through this?