well let me say that its only your attitude which is the issue here, many many people suffer much greater handicaps (even as simple as being born with a birthmark on their face) and managed to get on with life.
I was diagnosed at 5 and had my first surgery at 10, that caused some issues in my younger life but as Jack Torrence said:
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so that gives you a few years to come to grips with it ;-)
some advice: as a lad I despised religion (went to a catholic school) and discovered Stoicism. Those guys are all about building resilience not dependence (on the religion or god)
Some examples you could ponder.
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in this I'd say what you have to do is clear: pass your exams
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Lastly I'd say this comedic cartoon sums up modern people:
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to me the true problem is you don't have enough actual threats to your life and limb and being in basically a safe place fall prey to anxiety.
I recommend if you can't get a handle on it to see a psychologist.
be the one of these people:
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You only have one life, so enjoy it
Best Wishes