Is this a.d.d

So i don't get it. I'll get a random idea that I think is really cool, write it down, maybe draw a bit of art for it, write a few paragraphs of a script/story but after like, 5 months, I'll get bored of it, give up and the process repeats. I even have a list of things I started but never finished/thing I had in mind but haven't started.

A high fantasy school sorta story

A rewrite of the HBO Velma series

A creepypastaverse sorta thing

A Chris chan story that parodies him 

An idea for a type of isekai thats kinda like re:creators but the other way around

A twilight parody

A series that I can only describe as BoJack but without the animals

And thats it kinda.. I don't know why I can't commit to one, whether its an add thing or whatever. But like,, yknow?