Eclectic witch with a vampire sang girlfriend?

So I am my girlfriends donor and she was recently awoken. So in turn it really awoke my ability as a witch and in further research discovered I am a Natural Eclectic witch. But the thing is were finding out that I'm draining people. I'm not sure if that's a defensive thing or if it's an acquired ability? And how can I learn to control it. I am finding peoples emotions not very fun.