I have been struggling with self harm and eating disorders since fifth grade and not a single person knows about it.
Why didn't you let people know sooner? How big is your struggle?
I was too scared and ashamed to let someone know about my problems. The struggle itself is big and I feel like I'm incapable of overcoming these problems on my own.
It's a normal response to feel irrational shame about mental health issues but that shouldn't stop you from receiving the help you need. As you're aware, self-harm and eating disorders do not resolve on their own, a mental health professional needs to be there to help you work through those issues and give you support. There is no shame in getting help for your mental health.
Yeah makes sense. I just need to work up the courage to share it.
I'm glad you are on the way to receiving help. Take the first step and express your worries to those that care about you. Persevere and don't give up, your loved ones will help you every step of the way.