Does this make me a jerk?

If she says she is okay with it then she likes you enough that she is okay with this. I think she might expect you to go public eventually, but she is willing to be patient, so keep that in mind. You should just be who you feel you are. Don't let those around you be the judges of how you live. If you really like a girl enough to date her and if you want to make out with her, then you are probably at least bi. If you don't feel comfortable admitting it though, you shouldn't do it. Wait until you feel ready, or until you are sure. It is normal to hide it at first, so just relax.