keep climbing
you would be surprised many people who I speak to have various emotional and psychological issues. Life for many is a struggle. I have a close family member who suffers from severe social anxiety so I definitely can understand where you are coming from. I am sure that you have worked hard to get where you are in life and I think you should recognize that. Hashem is aware of your struggles and obviously thinks you are a very capable person who is able to deal with issues that others are not capable of.
As far as the height issue goes I have about an inch taller than my wife and since my posture has never been the best we appear to be the same height. When she wears heels I look like a dwarf. It has never bothered her and does not bother me. Hashem works in ways that may seem strange to us and it could be that your height is a way to ensure that you have the right zivug. Most mefarshim hold that we have little if any control over our zivug at all.
I would suggest that you take a look at the book Feeling Good: The New Mood Therapy by David Burns. It is a fantastic book and it may help you.