I am sexually confused between penis or vagina.

I wouldnt say you should've asked your cousin to do that. You don't want to get caught and have people saying you raped him, although I don't think your cousin would say you raped him. However, if you are religious I suggest you read the bible or the Torah or whatever religious study tool/worship books you have. It'll help. I promise.
If you're NOT religious, I simply suggest talking to someone about it. You obviously want to be the alpha male in any sexual relation, so I don't think you're gay. However, I think you really just want to "insert" into whoever you can find, and it's just hormones making you feel so sexually enhanced. Id say to masturbate alone, and make sure you don't get into anything you don't want to.

Don't worry, MANY BOYS DO THAT, I do that too, It's pretty normal for a teen. Gay porn and masturbate with another guy is so wonderful to have a very good time.

It is definitely possibly that your sexuality is still developing and you are curious and it may develop to some degree of bisexuality, you may start to like guys a lot more and lose interest in girls, or you may lose your sexual inclinations towards guys eventually. Now if I were you I woulden't worry much about what sexual label you fit into; labels don't matter and are artificial constructs. Sexuality is like a scale from 1-10 with 1 being completely straight and 10 completely gay and most people are somewhere inbetween. Just act on your desires if you get an (appropriate and safe) opportunity to do so. That said I do want to emphasize that just because you want to be the one doing the penetrating and/or the "alpha male" in your sexual encounters does NOT indicate anything about your sexuality either way. There are plenty of gay guys who are referred to as "tops" who only give it, "bottoms" who only take it, and "versitiles" or do both. And yes its common for gay guys to enjoy being either the dominant or the submissive partner in the bedroom. So those feelings on your part don't indicate anything really about your sexuality, since you also have the desire to have sex (topping) with guys by assuming the penetrating role. And plenty of gay and bi guys act perfectly normal and masculine, thats how I am. There are a lot more guys like me out there than people think; the flamboyant ones get the visability and people see them and know that they are gay, but when they see guys like me they assume we are straight. So the perpetuates the stereotype. I am actually assertive and masculine in "normal" life but in the bedroom I like taking the submissive role.