Does anyone here speak Japanese and can me help out with the meaning of this sentence?

Suzume May 4, 2016 2:56 pm

I'm currently translating a manga (for the first time) and have no idea what the main character could mean by that:
[てっきり
オレと同じ人間
なのかと思った]
If you need the context (probably you will)
overall, the protagonist (who is thinking this) was just "offered" to fuck with his neighbour after he scared away his neighbours really loud moaning girl (he could hear them since the walls are thin). But the protagonist was kinda weirded out by that offer (of course) since the neighbour misunderstood the way he was looked at by him, and after the main character told him he was actually looking at the beer he was carrying, the neighbour ran away, etc. now he first thinks [なんだ アレ](ビビった、あいつ) sth like what the fuck, getting all flustered/running away, that guy and then that part I can't really translate.
http://myreadingmanga.info/kocchi-muite-ai-jp/

Actually, it would be really wonderful if I could find here someone I could ask sometimes for helping translating some parts I can't understand no matter how much I google!

Thanks in advance

Responses
    guess May 4, 2016 4:30 pm

    I thought that you were the same kind of pwrson as i am?

    Suzume May 6, 2016 11:59 am
    I thought that you were the same kind of pwrson as i am? @guess

    I didn't know 人間 works for person/personality too! Thanks! I think, that's the only possibility.