How can i sneak out of the house?

Okay, so my mom sleeps in the livin room, my windows are really high and im scared that my mom will come to my room to check up on me and my friend. We wanna leave to meet these boys(horndogs) haha we really want to leave, but we have no clue how to get out. Dont say its wrong just answer how i can get out quick!!!! and what to do so my mom doesnt check up on my room and how to get back in without her asking where we were