Hey, Raven. I found it easier to first like myself :-) I did that by considering myself my friend and trying to treat myself the same way I would a friend. Sort of split your thinking so you think of yourself in the third person and go from there. If you hear yourself put yourself down, have your "better" friend self stand up for you. Eventually you notice the put downs are not very creative or accurate, etc. "That's stupid!" isn't very well defined; what exactly is "that" and what does "stupid" mean and why should you care? Just keep putting down the puter downer

and encouraging the you that is trying. If you make a mistake, it's just a mistake, you learn from it and move on; making a big deal of it doesn't help anything?
Eventually you realize you are doing pretty well with "you" and the "two" of you :-) are buddies and you feel more confident, etc.