Is there a reason why I have negative thoughts all the time?

Ever since i was young, negative thoughts have prevented me from doing a lot of things and i missed out on some great things that could have happened... Why do i think so negative and worry so much about little things all the time?
Its Normal
Its something i should worry about
I'm creating my own negative thoughts? (IDK...)
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Is there a reason why I have negative thoughts all the time?
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