Just started tattooing, advice needed

So I've been an apprentice since the end of May, and I just got my certificate a couple weeks ago. I've done 13 tattoos on real skin so far and I don't know if it's nerves or something but I'm just really not feeling it. The initial excitement was great but it's kind of worn off and I hate the anxiety that I get waiting for clientele if there even is any, and the anxiety that comes when people actually do show up for walk-ins, like whether or not I'd be capable. All around I just get a bad feeling from most of it right now, and I'm really not feeling it. Does this wear off eventually? Have I given it a fair shot? I don't just want to kind of throw it all away and if I backed out I couldn't help but feel like I wasted my mentors time considering I just got done being an apprentice. I'm pretty torn and I would really appreciate some advice.