Repeated Destructive Pattens and How to Stop?

i realized that i've been repeating this same pattern of procastinating instead of getting my work done, i just turned 18 and i want to do some freelancing but i keep holding myself back from making a portfolio of my art, and i am aware of it yet i feel like i didn't do much effort to stop myself, maybe im just lazy, but please anyone give me some advice on how to stop this, i dont wanna stay this way and i already thought of a few motivation as well but i just keep repeating the same shit everyday except making a portfolio :c