is it good size?

That is not normal. 10 inches is huge, especially for a 14 year old. . Maybe you need to measure again. Measure along the top, from the pubic bone to the tip. Average is like 6 or so.

My cock is 1.5 inches soft and not really a grower - my gf says it’s the smallest cock she has had in her well used flappy cunt

I would ride it and let you ejaculate up me

Can you suck your own cock and spunk in your mouth

That’s quite small in the real world - mine in 11.5 inches and really fat