You already know what your problem is. You have a long history of being overly anxious. It’s possible that you have a sensitive temperament. It’s possible that when you were young, you didn’t get the coaching and support you needed so you could learn how to be more confident and less afraid.
There’s plenty to be anxious about in modern life. Lacking sufficient skills for self-calming and for self-protection, you are too emotionally open to manage every day stressors. It’s as if your nerves are too close to the surface.
If you can get to a therapist, please consider it. A therapist will help you come to terms with your fears and will help you learn to use your sensitivities in a more positive way. If you can’t get to a therapist, get yourself one of the workbooks on how to handle anxiety from one of the online booksellers. In addition, I often refer people to the book “Feeling Good: The New Mood Therapy” by Dr. David Burns.
Please follow through and start educating yourself about anxiety. You deserve to live a life that isn’t shadowed by so many doubts and fears.
I wish you well.