I really want to give a blow job. Im a 20 year old straight guy and im curious about giving a blow job. Is that normal?

Go to a toilet stall with a glory hole, and wait around awhile.
Or buy a suitably shaped vegetable or fruit, and use your imagination.

Yeah it's fine. Don't worry about it.

Of course it is, if you had a chance to experiment, I'd say go for it :)

It's fine.
It's not as fun as you think it'll be. Unless you're like really into the guy you're giving it to. But since you're straight, that's probably unlikely.

You can't be all that straight then.

Really, I think labels like straight and gay are quite silly. They're just ways for people to put each other into neat, clean categories. We're all somewhere on that sliding scale. I'm not interested in delivering a blowjob, but I would get into bed with a guy able to convincingly be a trap. Too bad there are so few of them.