Im pretty sure i have

Question

im pretty sure i have my singer 5525 threaded right but i think the bobbin is wrong but when i try to sew the top looks fine but the bottom is a thread mess an the thread keeps breakingMy sewing is a mess. The top thread skips some times and the bottom is a total mess. It brid nest (piles up undernith and the thread break. I have re threaded a number of times and I have taken the bobbin out and put it back in . I have changed the thread tension. nothing seems to help.