No not at all , as long as you KNOW that he's adopted. Theres nothing wrong with the way you feel, and even if you think its wrong, theres nothing you can do about it. Talk to him about it and tell him how you feel , you never know, he could have to same feelings for you!
I don't think it's that weird considering your not truly blood related and your 2nd cousins! That's hardly a relative anyway lol But you might wanna make 100% sure he likes you too before you try anything cuz that could cause some weird problems with the family... and you may wanna wait until your 18 too! Just my advice.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.