Hello, welcome to RYL.
Sorry to hear that you're not doing too well. Where's your head at with self harm- do you want to stop/reduce?
I think most of us here have told multiple lies to cover up self harm before (I genuinely never lied about anything until I started self harming). It's not ideal because often the person we lie to might be able to help if we told the truth, it's an in-the-moment self preservation thing and I don't think you need to beat yourself up about it.