Is this normal for a 14 year old?

i am 14 and get really angry and frustrated eaily for example this only happens in my coursework write ups, i cant get cross what i'm trying to say like im finding it hard to find the right words or i'll get confused. also i can zone out really wuickly for example i could be doing my maths work and all of a sudden i will zone out and start thinking of a fit boy or my dream of becoming a singer. This also happens when im doing something i like to do for example i love to read and i know its a bit geeky but i do and i could be reading a good book and then zone out but my mind is still following then the book then i will have to read that page all over again. I also get really frustrated if i cant do things first time but when i'm not like this i have been told im a really nice person that can control there anger and is very clever but i dont feel it because i can be sitting in maths and i can be really confused by the way things are worded or put but when they are explained to me i can work them out pretty easy if i was focused when i was tought it and i am in the top set for maths. But wheni do zone out i mostly think about singing and just genrally being on stage.