How to be less negative!?

Hello!! I (24F) am in a really weird point in my life where I’m not anywhere near where I need to be financially or career wise, and am not enjoying the path I’m on. That being said, I have fabulous friends, an amazing partner and I have a lot of hobbies and things I like to do. I have a lot that I am grateful and lucky for.

I feel like I’ve fallen into the cycle of being super negative, and I’m acutely aware of it. Like my thought processes are usually focused on negative things, e.g if my day was great but one minor negative thing happened I always end up fixating on it and talking about it to other people… I hate it about myself and I never used to be like this!! I also have found myself being negative about other people, and catching myself mid sentence thinking ‘wtf are you doing talking about other people like that?’! I am sure that I’m not coming off well to anyone (including myself) and I’m actively trying to fix it, but i need more concrete methods of not fixating like this. I used to be genuinely positive and I feel like I was much better at handling stress and staying level headed.

I don’t want to be a negative person and I’m actively trying to practise gratitude and positivity, I just can’t seem to shift my mindset away from being negative and pessimistic all the time.