I have lived for a long time with these self same feelings and for me it nearly killed me when I was 21. Sadly in those days there was not much help for me as the internet did not exist and neither did a lot of self help books to help you overcome.
I have found this little book which may help you to find a way to deal with your own anxiety. I pray and give my fears and anxieties and fears to God which has helped me since I was 21. So if you are interested in finding a long term permanent solution to your fears, then please read my other blogs which may be of some help to you.
In the meantime here is the little book I meantioned for your benefit.