You are NOT a sexual failure!!!!!!!!!!!! Speaking as a man, who has never given a bj, but received many the only advise I can give is just take the plunge. There is no such thing as a bad blow job!!!!!!! Your boyfriend will be able to help you by telling how and what to do. I thing as long as you want to please your man you will find a way, it's those woman who just absolutely refuse to do it that never give a blow job. In the words of a famous American "just put your lips together and blow."