If you want to think positively, it often helps to look at the bigger picture. Are the things you are worrying about really that bad? Will they still worry you in a few months or resolve themselves? People often get caught up in little details that bother them, while their whole situation is actually quite good. 
Another way to think positively is to compare your situation to other people, whose lives are more difficult than your own. People often forget their privileged circumstances while worrying about small problems.
Lastly, if you are worrying about a specific situation, like a meeting or a task you have to do, it helps to tell yourself that you can do it, just like you have achieved other tasks in the past. 
You can do it!
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