Realize that it's a choice to respond to things this way. This feeling comes from a certain set of assumptions and learned responses.

Remember that people are bad at predicting the future. Look at the historical track record of people predicting the implications of technological advancement. You'll find that almost nobody gets it right. Granted, that sometimes means that things are worse than we expect, but there are also many cases where things turn out better than we expect. If you're prone to focusing on potential negatives, maybe you can consciously balance that out by forcing yourself to imagine potential positives as well.

Try to focus on things you personally have control over. Why worry about something that you can't change? Focus on problems that you can contribute to solving.