At a loss

I have been working as a network salesman for nearly ten months. My job is to promote software products on forums, websites, here and there, to be exact, to do everything that can attract potential customers to our websites, thus bringing sales to our department. However, from time to time, I'd ponder over whether it is the job I truly want, whether I am suitable and qualified for my current job, a job I'd never thought I would take up after graduation. Full of zest and anticipation, I came to Shenzhen in late June last year. Fortunately, I got the job offer soon. After getting the admission notice, I felt no hesitation to refuse the other two or three job interviews, as I was very confident of being qualified for the job, of making great achievements, and above all, of making great progress. Yet, looking in retrospect, I think I am a loser. I can do nothing but some work concerning product promotion. Compared to other promoters in the company, what I do is rather superficial, or say skin-deep. No one is to blame but myself. I ought to have sought for help the moment I realized it was not the one that suited me. Being engaged in the job I dislike is the reflection of not taking responsibility for my superior, and for myself. After knowing I had the intention to quit my job, my superior had a chat with me. She said she'd try her utmost to change a kind of job for me, like website editor, customer service, document writing or customer contacting. However, she still suggested that I feel free and courageous to do promotion work to the fullest. I was very grateful to her, yet I didn't give her a positive reply. I am at sea as to what suits me, what does not. I find my confidence gradually fades away. I don't want to waste time any more, though I am still very young. I have been working hard all the time and I have clearly known nearly all the promotion methods. But I felt helpless to adopt them very well, or rather, make full use of them. Though sometimes I can see optimistic effect, I know my drawbacks more clearly than anyone else. I show little interest in the job. I can't find enthusiasm and fun in my job. I'd depict my job as simple repetition, lack of creativity and innovation. And this is just what every job needs most.However, I will once again give myself some time...Everything is difficult before they are easy.