If you were 14 and thought you were gay would it be true or just a phase?

All men and I assume all women have at some point in their lives had a same sex experience or have thought about it. At 14 it could be that or you are figuring out who and what you are attracted to. I wouldn't worry about it either way. You will have an experience or not. We all come to terms with it in different ways and at different times.