Little ONE, you sound neither stupid nor ignorant--you're asking great questions, and questions that EVERY person should be asking themself at your time of life.
Me: when I was younger (late teens, basically), I did think it would be more "convenient" to be straight, but it wasn't something I longed for. And when I started coming out at age 18, I thought I would like to have children, and, as many people here have discussed, realized that I could have children perfectly well as a gay man. As the years progressed, however, I came to realize that I was not as interested in raising children as I thought, and when I met my partner, the fact that he definitely did not want children was not a problem.
My only advice to you is: be as honest to yourself as you can be, and be as honest to your partner (of whatever sex) as you can be, as well, about your sexual feelings and your desire to have, or not have, children.