OK, let's do a hypothetical situation here. Now, your partner cheats on you, comes home and the two of get it on. Now, since she slept with someone who has an STD, SHE now has that STD and has passed it on to YOU. Let's say that the STD you got from your partner is herpes. Are you aware that there is no cure for herpes, and if left untreated, it WILL kill you? So here you are with a deadly STD, counting down the days of your life and saying "Oh Lord, I wish I had listened to You." :/
You are defiling your body and the body of your partner. A female's lips and hands should not roam over what a MAN'S hands should be roaming over, if you get my drift. The private parts of a woman are reserved for a MAN to explore, not for another woman to explore. And you ARE hurting others. You're hurting your families, your friends, etc. Surely they would rather you be straight again. I'm sure that your family and hers are probably embarassed when people ask them, "is your daughter a lesbian".. :/ Their cheeks probably burn flame-red when they have to answer, "yes she is and she's going to hell for it".
And, MDD, hell is exactly where you're headed, because you're rebellious and unrepentant and you shun God's word even though you DO know His truth.