That's called being bi dude. Either that, or you just have some really weird fetishes. The faster you come to terms with either being bi, or your extremely bi like fetishes, the more at ease you'll be with yourself.

It is normal for some straight guys to enjoy entry while masturbating because of the prostate as well as the enjoyment of watching yourself while doing it.
If you have any sexual attraction to guys though there is a chance you are at least bi.

Stimulating the prostrate through the ass is supposed to be the male equivalent of the G-spot. I've never tried it personally, but I've heard that it actually works, and feels good.

I use my body wash to lube up my ass and shove it in there during a shower. It's why I take 20 minute showers lol.

I know for a fact that I am straight, but I like sticking stuff up my ass.

You are 13 and you are exploring your options.

You are not weird.

You are not gay.

If you say you are straight then guess what you are!

Just because you like things in your ass does not mean you are gay. Period.