Just got back from a three day song writing and performance course at the Leeds College of Music. It was a fantastic experience and I would highly recommend this course to anybody in to composition. I also met some other great musicians of a similar age to me (I am 14, the course was 14-17 year olds). We came away with three finished tracks and performed them all live at the end of the third day. It was great fun and a highlight of my summer holidays.
More info here: https://www.lcm.ac.uk/courses/short-courses