I think it's important to:
1) Remember - You don't technically need reassurance; everyone is loveable, everyone is intrinsically worthy, and everyone has a past. I also struggled with self-harm, I've also asked myself if I was unloveable being a trans man (born F, started Testosterone when I was 18... Anyway!..), and I also judge myself too harshly based on what others say/or what I believe they think about me lol.
***Key point = If you're going to compare yourself, compare the good parts of you to the good parts that everyone has. I've found it extremely helpful at least :)
AND
2) Remind yourself that you are NOT your OCD, nor your thoughts, nor your actions, nor what society caters to. What I mean specifically here is: Every single thing in this world is here for a reason, however large or small or whatever; it is. Radical acceptance is similar to ERP, I've found accepting myself as my inner will is much healthier than accepting myself as whatever society has us think.
Personalize the good parts - shift your gaze to the smaller, meaningful, sweet things in life - compare yourself to a healing butterfly, a tiger's fur, an innocent child needing a hug. I've found it boosts my self esteem, especially as a man, actually! (Because it helps me let go of gender roles / dismissing myself)
TLDR: Change the scale of your view when your thoughts try to turn you against your life. Your life is intrinsically valuable EXACTLY AS ALL lives. When it feels less so, ask yourself "so what, if that were to happen, I wouldn't die. And if I did, worrying about this wouldn't matter anyways because I cannot control [the other side of] life after that." AKA: When things feel too big, think smaller. When things feel insignificant, connect more. Hope this helps!!! ❤ (new here, unsure whether reassurance-granting is allowed as I made a post that gave me rules to not ask for reassurance because it's unhelpful... True in my experience as well, anyway yeah, thanks for listening!)