I can't tell why or what it is other than human nature some take it harder than others. Maybe speaking to a therapist would help you understand why. The best thing I can advise is to start looking for positive ways to cope. Make a list of activities that would make you happy and do them. Look up positive affirmations and pick your favorites to repeat each day. Visit the parts of this forum that has good vibes such as The Coffeehouse!
The Coffeehouse - Forums at Psych Central
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Just keep swimming
I have BPD or Autism or both, we may never know, the focus is always the symptoms, not the diagnosis