It is alright to have butterflies in your stomach. Just make sure they are flying in formation.
Everyone get nervous, especially if you have to speak in front of a group of people, pitch a product, sell an idea or any other manner of things. It is ok to get butterflies, everyone does just make sure that you use this nervousness to your advantage. Having butterflies or being nervous reminds you that what you are doing is important to you. If you can control your butterflies and get them to fly in formation you will draw on incredible power to present your very best as all your faculties will be concentrating solely on the task in hand without being distracted by external stimuli. Butterflies can be your best friend in a stressfull situation, take time to learn how to control them.