Usually means when you're nervous about something or someone. It's also a happy feeling when you're around someone you really care for. It's actually a good feeling to me. Nothing wrong, just being a little nervous is all.
What does it mean when you "feel butterflies in your stomach"?
It could be from the feeling of someone you - like gives you butterflies in your stomach. Sometimes serious issues tend to give us butterflies in our stomach such as when I had to get a MRI done. With contrast it made me nervous cause I didn't know the outcome.
Then I guess I have butterflies every time I see my crush
It could be that you're nervous.