Honestly, why would God make this soo hard (to not do it), and then not want you to masturbate instead of having premarital sex? At no point is it mentioned in the Bible, probably because the people at the time saw it as a natural part of living and decided it was not important enough to even be mentioned ONCE! Besides, if you DON'T masturbate, you ejaculate it all in a wet dream anyways! You can still be at this church and masturbate; it's your PERSONAL relationship with God and you own beliefs that matter.
By the way, this is coming from a Christian... who masturbates every day