Im pretty good with MJ and this signature literally has none of the traits that I consider to be authentic. Not only is it a forgery, its a very bad one, IMO.
There are many, many threads on this website containing hundreds of examples of real (and fake) MJ. Spend a few minutes searching for them and you'll quickly come to the same conclusion, I think. I have one on my personal page for reference too.
Its always a bummer to find out you have a forgery, but it is what it is. Sorry to be the bearer of bad news!
This is far off from a genuine MJ in my opinion, sorry to say. The letter shapes are mostly all wrong. Do you own it? If so, when did you buy it and is the seller a dealer or still active today?