I need help here.

So my friend Yadi wants me to go with her to Homecoming, which is next weekend. I don't want to go because I've never been to a school dance before of my own choice. The last times I remember being at a dance was in 6th grade when we all had to go and I mostly tried to stand in the corners. The second time was in 8th grade when again we all had to go here I mostly hid and sat like a wall flower, a girl asked me to dance with her but I was very shy and felt shy dancing with her because I didn't want to embarrass myself. Well now I'm a senior and I've never been to a party or school dance. Which brings me back to the point that Yadi wants me to go to Homecoming with her because she's nominated for Homecoming Queen and doesn't have a date yet or knows with who she'll be there.

What should I do?