The question of when someone is old enough to decide their own sexuality is a complex one, and there is no single answer that will be right for everyone. Some people may feel that they know who they are attracted to at a young age, while others may take more time to figure it out. There is no evidence to suggest that 16 is too young to make decisions about one's own sexuality, and in fact, many people who identify as LGBTQ come out during adolescence or even pre-adolescence. Ultimately, the decision of when someone is ready to decide their sexuality is a personal one, and should not be dictated by anyone else.
It's important to note that there is a difference between sexual attraction and sexual activity. While some people may feel attracted to someone of the same sex at a young age, it is not illegal for a person under 18 to engage in sexual activity. In the United States, the legal age of consent is 18 in every state, and it is illegal to have sexual contact with someone who is underage.