How to improve public relation ....

What exactly is public relation to you? We (in my country) only use it if you have something to "sell". Well I think that is what it is about. You have to find out what people (the one you like to approach) do find interesting, next step: be inventive, Original, unique, but above all yourself. Nobody loves fake. You can sell a product or yourself as long as you believe in it. BTW it doesn't matter if you are shy, stumble over some words, etc. what is important is that you believe in what you say and spread your enthusiasme about it.