yeah thats like me, im 16 too and until i took Fashion class last year i had never even known what a sewing machine looked like really ! ahah, ive only sewn one big project in my life and it was a shirt, and i got a 90% on it, sewings not that complicated, and that project was pretty hard. I suggest making a makeup bag or something!
At your local fabric store there are alot of "easy" patterns that you can make many things, go check em out !!
im obsessed with sewing now, its all i think about bahah