You are not powerless to the whims of consumerism. There are many ways to start getting away from consumerism and start a new attitude towards your life and priorities.
1. Make shopping akin to grocery shopping: Do you ever grocery shop with your friends as a social outing? Do you ever do it to make yourself feel better or just for fun? Didn't think so. You should try to only shop when you really need something, like when you grow out of your clothes or they begin to wear down.
2. Ask yourself the basic questions: Do I really need this? When will I use it? How long will it last? Is it worth my money? Could I be spending my money on something more useful?
3. When you do buy, buy sustainable: Anything and everything disposable is specifically manufactured to only be used once or twice. Instead, buy sustainable products that allow you to use your products for a longer time, meaning you create less waste.
4. Find other things to do besides shop: Many times going to the mall seems like the only thing to do. Try doing something new, like riding your bike, trying a new recipe at home, doing a project for charity, or developing a new skill.
5. Make a garden: It will make you feel less helpless and more able to be sustainable yourself. It also makes great food, the healthiest you can possibly make! Not to mention it takes up time that you would usually be spending shopping.