This was a problem of mine growing up. I had to overcome this fear to pursue my career choice so I understand the issue.
The first thing I would tell you is that you are not "good" because you lack confidence. You may fear that you will appear ignorant, or that the person you approach will reject YOU as a person.
1. - Know the subject well. Any person that you talk with will quickly evaluate if you know what you are talking about.
2. - Don't be a "Salesman". When we think someone is trying to sell us something our guard flies up at warp speed! Present your offer as something valuable for your listener.
3. - Don't beg. Give the information and shut up. Give them time to consider the value of your offer!
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This was a problem of mine growing up. I had to overcome this fear to pursue my career choice so I understand the issue.
The first thing I would tell you is that you are not "good" because you lack confidence. You may fear that you will appear ignorant, or that the person you approach will reject YOU as a person.
1. - Know the subject well. Any person that you talk with will quickly evaluate if you know what you are talking about.