How do I stop being nervous around her?

ok so yesterday the girl I like , jen , stood in front of my house for like 3 hours while my sister was at gymnastics . she kept telling me to bring her some water but I was nervous . then my sister came home and asked why she was there and I told her I didnt kno. then about ten mins later she invited her inside and they followed me so I ran in my room and locked the door , I didnt come out because I was scared and nervous. what made it worse was that my whole family was outside my door too. I wanted to come out but not when everyone is gonna see what we do together . anyways I wanna kno how I can be less nervous around her, any idea can help. I really like her and I want this to work. thanxx

Is your sister ok with the two of you being together? Did that situation resolve itself? She likes you, right?

Just be yourself. Don't put so much pressure on yourself to make yourself and everything around you perfect.