why do I feel nervous in front of the public and how I over come the nervousness

Whatever situation i will feel nervous although with my friends only.I always feel nervous especially when I'm speaking in English. It is because they will look at me when i talked in front of them. when they show the boring face, it can make me more feel nervous and i will thinking ridiculous to them and ask myself why they are like that.Maybe I'm not a good in speaking or maybe they are not interesting what I'm talking about.I'm also feel nervous because of my grammar are not so good.I also not usually to present when I'm in front of them.Everyone will feel nervous when should do that, right. I also always feel not confident with my language especially when I should speak in English. I will thinking they are always laugh to me.
Although, it have many way to how i over come the nervousness. Firstly, we should take a breath for a second because if that way, we can calm down and feel more comfortable with our self. Secondly, we also should be prepared whatever situation if we must sit in front of the public. Lastly, if I can't to follow that all the way that i said, i will pray to God to give me strengths.
Everyone will feel what I fell like nervous if they are in front of public. Every person will have their own way to over come the nervousness.Whatever, we must get ready and must learn more to how to get the nervous to lost in our head.Don't always thinking you are shy and quietly person.