Is this normal? please read..

Hi, easier to ask question here along with an explanation.

Anyways,

When I haven't done anything sexual for a while, masterbation etc and feel horny, I like men on men sex, gay sex, really turns me on and I often jack off to this, especially porn with big, big dicks!

After I've finished materbating, I straight away need to turn the film off as I do not find it attractive anymore..

When I'm not thinking about sex or w.e I find women highly attractive.. but at the same time can appreciate a mans looks.

Am I normal?

Btw, i'm 19.

Thanks.