What I am doing Something Wrong With Me?

I am working now. I felt feel frustrated when I sent send emails to potential clients, but and they don't give me any reply...Is something wrong with my emails or others? I don't know why. I am trying to find the answers.

Nothing wrong.  Your emails are letters of solicitation.  So people ignore them just like I do.  I or rather the automatic software of the email system treats them as spam.  Unless they have something they want from your company, they are not going to waste their time.  Remember your company is not the only company sending them mails.  I am sure that they cannot reply all of them!  We are only human.  Would you do the same thing if you are on the other side?