I am pretty new to

Question

I am pretty new to sewing and my machine. I just changed thread and put in a new bobbin. Now my stitches look correct on the top side of the fabric but awful on the underside. There is a ton of extra thread. I have tried to re-do the threading of the bobbin, but I am not sure I am doing it right. The tension is set to auto and I am doing a straight, tight stitch. I have a singer Inspiration.