I am a 12 year old boy and write compose classical music my work inclused one Cello Sonata Scottish Dance few Concertos Is this normal?

Yes, it is rare but totally possible for a 12-year-old boy to write and compose classical music, including a Cello Sonata, Scottish Dance, and a few Concertos. Talent in music composition can manifest early in life, and some child prodigies have demonstrated advanced musical abilities at a young age.