Am i transphobic?

I'm pretty socially liberal. I support most liberal causes. But the transgender thing perplexes me.

I don't have an issue with people wanting to live their lives as whatever gender they want and I don't have an issue using whatever gender pronoun they prefer. But, I just can't say that I honestly think of them as doing anything other than playing pretend.

I don't think they should be discriminated against or forced to behave like or use the facilities of a gender they don't associate...

Am i transphobic?