motivation

i have so many projects i've started and then just left alone,i lose motivation so quickly,half done posters,half finished sewing,paintings and more,i dunno why,i'll work on it really hard for like two or three days and then i'll abandon it for months or even years before i take another look at it,it's so annoying,i have this blanket that is like 90% done,but i havent finished one of the seams,so theres just a hole between the two layers.i just don't have the energy to finish things.