Hi RosaMaria
As I said, you will fiind out quitre quickly if this is something you are comfortable with and also if it something you can do with any hope of a future as a musician.
If yoou are good at it, your confidence will build as you go, and if you find that you are terrified performing in front of people, you will know that this is not the career for you, and there is nothing at all wrong with that.
Performing in public takes a certain set of skills which are born with, so if it turns out that you don't have them, and this is not for you, that is absolutely nothing to worry about - you will be in the majority.
You can always write for someone else - lots of people have highly successful careers writing material for others to perform, so consider that if the on-stahe part does not work out as you want it to.