For panic attacks there are meds. They help a lot to feel calm. Panic attacks or constant fear doesn't help you in life, they prevent you from living. Ask for meds, they help a lot if you struggle with anxiety disorder.
The perspective you have may change, I've seen a 105 year old talking he was so tired of life. If you are in constant pain, or horrible situation, life suddenly isn't so great.
Life is great when you are young, so enjoy it. The future doesn't exist yet, so don't overthink it.