I literally cannot believe your last sentence, how can you, in good consciensce say that, simply by someones actions? Especially at such a young age, when one is so young and has no conception of sexuality as one has not yet reached puberty, making judgments about sexuality is impossible. Acting in a 'camp' or femine manner is much more likely to be a product of environment than as a true expression of sexuality.
Furthermore; genotypes and the expression of genes (phenotype) is only to do with genetics and cannot be altered by "chemical imbalance".
Full disclosure: I'm gay. and am currently on my 5th or 6th double rum and whatever mixer i can find.