Can I try and break my bones as self harm?
That sounds horrible. Why would you try to break your own bones?
Because I wanted to cut myself but I didn't have a knife handy at the time.
If you feel a compulsion to harm yourself, you should see a mental health specialist. It is dangerous to try to cut yourself or break your own bones. You should get help to discover the root of your problem so it can be alleviated.
I'm not a baby. I just wanted to try to break my own bones but I was unsuccessful.
I am glad that you didn't succeed in breaking your own bones. But you might later on so you need to get help now so that you won't attempt it again.