How do I change?

I’m a 13 year old girl and I need advice

This probably won’t get much attention, but I just wanted to ask what is a good way to force myself to change.

I personally struggle with being lazy and not reaching my goals and in the past, my methods were, nothing less of a challenge

So just general question how do I change and what to do to force that change because I don’t like the person I am now and I want to get better.