Argh! Just wrote a long post but it got deleted by accident. I basically just wanted to say that I get how you feel. I feel like this too when I am low in mood (I have bipolar disorder and suffer from recurrent depression). I’m having a really bad day today and feeling the same way. You do sound depressed to me - which isn’t to minimise the hurt and the harm these bullies did to you, but I do think people focus more on these old psychic wounds when they are feeling depressed, and I would encourage you to get some help with your depression (feeling worthless and useless etc. is an absolutely classical symptom of depression in case you didn’t know).
Some mean girl style bullies said some pretty awful things to me as a young teen too, and I don’t know why but they absolutely do come back to haunt me and ring in my ears when I’m low and especially when I am being unfairly treated or criticised. Although it all receded at Uni where I was actually very popular, I was then in an abusive marriage which made it worse, and more recently the vitriol from the general public towards GPs (I am a GP) during the pandemic has also made these girls voices come back in my ear telling me I’m ugly, I’m worthless and useless, I’m a loser, nobody will ever love me, I’ll always be alone etc. However when I’m depressed there is a tiny “logical” part of my brain which is saying “of course I’m not a loser”, and it’s important to listen to that part of your brain and not squash it down with evidence that you are by letting your “emotional” brain completely take over. Don’t let the bastards grind you down!
I do think there is something also in what others have said that it can be a self fulfilling prophecy if you’re not careful. That sounds really harsh but it’s not meant to be. I do think you sound worryingly low in mood at the moment, and I appreciate that right now you may simply not be capable of just “being positive and confident” etc as people will “helpfully” suggest. And I have limited time for “The Secret” type nonsense. But there is a truth to the fact that if you walk around expecting to fail at everything and thinking you’re not good enough, then you will not put yourself forward for some opportunities you might have done otherwise and even if you do try for these opportunities, you may not be selected for them if you deep down think yourself that you’re not up to the job etc. as others can pick up on that. And if you walk around thinking you are fab and expecting everything to go well for you and opportunities to fall in your lap it doesn’t hurt as people pick up on those positive vibes too! So it’s important to try to turn it around. I know only too well how it can be a bit of a vicious cycle of having your confidence knocked and then being afraid to take opportunities etc. And it’s so hard to change that once you’re there. But just as you can get into a negative cycle, you can take steps to change it to a positive circle, however I do think you need some help with this at the moment from a counsellor, friends and family, and possibly antidepressant medication too. And I don’t think you can just decide to do it and in the next instant be fine, it takes time and work. I think CBT therapy would really help you.
I do think there are often typical characteristics of those people who tend to get bullied and also those who bully. However, it might actually say more about them than you that they were bullies or that they picked on you. A lot of bullies do it because they are jealous or unhappy or being abused in some way themselves. Looking back I genuinely think some of my bullies were simply jealous of me because I got good grades without having to work very hard at it, and my parents weren’t divorcing etc. Looking back I actually wouldn’t be surprised if one or more of them was even being sexually abused and taking it out on me, a “safe” target who would not retaliate. I think it didn’t help that I went through puberty late, making me an easy target for bullies, but it’s not exactly something I could have done anything about. Because they picked on you doesn’t mean you did anything wrong or what they said to you was true. What do they know, they are just 13 year old mean girls trying to get a reaction!! The objective truth is that I was actually conventionally pretty, which I realised when I went to university, so for example being picked on for being ugly, I don’t think was really anything to do with the fact that I was objectively ugly. It was just something hurtful to say. Unfortunately it doesn’t stop me feeling like I’m ugly on bad days especially now I’ve gained a lot of weight. So I do understand your pain because today I feel all of those awful things about myself and on top of that I’m frustrated that what some stupid bullies said to me age 13 is still affecting me now in my 40s.
Try and get some help for depression and talk to family and friends who will be able to reassure you of your non-loser qualities!