Nexplanon freak out..

So I'm supposed to be getting the nexplanon implant later today.. I'm now not sure I want to follow through with it. I've read so many bad things about it and I honestly don't/can't deal with any of it. Like weight gain.. I already have a hard enough time liking myself now and I'm 110lbs on a "bad" day. And acne. I only get acne (minimal) when I'm starting my period. Plus mood swings. I have bad enough mood swings as is. I don't think people could handle me if they got worse. And I keep reading horror stories of people having periods that last weeks if not MONTHS! Months people!! I'm not okay with that..