Public Speaking Skills

I have been thinking, what is it that makes me nervous before making a presentation about anything. So this is what I think about myself.

1) Fear is a self induced nervousness that is based on what I think others would think about me
2) Fear of a boring speech.

Then again, I think that I am quite a warm person and am willing to be open and shared things with people. So I should not be too fearful.
I think the second pt is more fatal. Generally, if I am willing to share, I can make things sounds interesting when I am enthusiastic. I think, perhaps the start of speech can be a bit more cool putting people at ease first, before getting enthusiastic about any subject matters.