Yes, it is correct that we're in a democratic world (most of it) and there should be no interference in people's personal lives as they have the freedom to do as they wish, in a limited way. But personally speaking, this 'gay' thing is not natural. Nature didn't manufacture us that way. During an intercourse, the introduction of Y chromosome leads to the birth of an offspring who has a possibility of bearing an extruded reproductive organ known as 'penis'. If the Y chromosome is not introduced, the already present X chromosomes get away with other X chromosome which leads to the birth of an offspring who has a cavity between its lower limbs, known as 'ovary', again a reproductive organ.
Some amphibians do change their sex to reproduce, but those circumstances are way different. Humans would have evolved like that if there was a need. But clearly, there is no need for 'gay' and 'lesbian' relationships for our species. As for feelings, there is nothing bad in getting close to someone of your gender. That is why the term 'friendship' was coined. But if you start getting sexually involved with them, you're exaggerating it either under someone else's influence or otherwise. Again, this is my opinion. And I'm not critical of gay or lesbian relationships. Who am I to protest anyways?