What do you mean you "just joined"? If you are in DEP, you are not an Airman, nor are you in the Air Force. Your official paperwork to be in the military doesn't happen until the day before you ship to BMT. You are a "recruit" right now, then will be a "trainee" in BMT, and upon successful completion of BMT you will be given an Airman's coin and the label "Airman."
And no, you can not say you are a lesbian to get out of a deployment. If you go through with this action you will be court-martialed and hit with the UCMJ under an Article. You will also be discharged from the Air Force all together.
If you don't like the idea of spending 6 months away from home, tell your recruiter now before anything is official.