His prompt to seek help from actual professionals is correct though.
It's not because we don't care, Kaylie. A lot of us have either been there ourselves at some point, or known someone close to us who was. A lot of us can relate with the feelings you describe.
We can share some words of comfort, and we can give you some good advice, as several posters in your other threads already did. But the best piece of advice is one several posters have already given you: reach out to people who can help you, face to face. A counselor, a therapist.
Depression is no joke. Cutting is a sign that you need help that goes beyond what anonymous people on an internet board can provide. You don't need the risk of running into some white knight with a saviour complex, which is always a possibility when seeking support online. You need to talk with people who know you well, hopefully your parents if you have a trusting relationship with them; and to talk with people who have the professional experience to dispassionately assess what you need and guide you through, step by step.
When you're depressed or overcome by anxiety, it feels like no professional would truly understand, that they wouldn't be able to help anyway; or just the thought of finding one, going there, dealing with it seems overwhelming. But that's a trap, that's how depression wins.
Same when it comes to sharing what you're feeling with people in your life - easy to think they wouldn't understand anyway, or to feel like you'd be burdening them. But that's a trap too. If you do have people you trust in your life (and I know not everyone does) - like parents, a best friend, maybe a teacher - share what you're dealing with, and seek professional help through them.
The hardest thing here is also the best thing: opening up with people you can trust, in your own life, and finding experienced help. And trying again even if the first person you turn to turns out not to be too helpful. It will help more than what a bunch of strangers on the Internet can say, no matter how well-meaning we might be or how well we might think we can relate.