Hi there, sorry it took a little while to get back to you, it's been a very busy time for me. Any how with regards to your questions I think the best thing I can say to you is read a copy of my book, you get get a copy for free now with the free newsletter sign up "Follow This Link" I cover confidence and self esteem and some of the other issues in it in much more detail.
It's a difficult topic to cover here really because it's so big and involved. Briefly though with regards to your question it seems as though your problems are being caused by a lack of identity. When you are very clear about who you are and what you want then taking on the identity of others becomes a thing of the past.
Like I mentioned I cover all of this in the book. Have a read and if you still have question feel free to contact me again and we can get more specific.