It looks like a lot of your sketch lines aren't actually connected/constrained to each other (see below, I was able to click and drag these out of place). The "blue" lines also indicate that the lines aren't fully constrained in the sketch space.
Start out by taking a look through your sketch and see if you can work out how to fully connect/constrain your lines, and this should gradually resolve your issue.
Edit: You also have sketch lines overlapping each other, which I'm assuming aren't necessarily by design. Fixing/eliminating these unnecessary overlaps will aid you in fully constraining the sketch as well.