Artie, Let not your heart be troubled. You are doing fine. A couple of points;
1. Back in the day, when I started scrolling, I was using a Sears "hobby saw" , 3 " pinned blades, spring loaded, no tension adjustment. I was working on a project of my own device; small boxes made by using a patterns from one of Spielmans books, hearts, teddy bears, butterflys, etc. I would take 3/4 pine and sandwich it between two pieces of 1/8 plywood ( so a 1/8 ply, 3/4 pine, 1/8 ply), cut the outside shape, remove the plywood pieces, trace the same shape on the inside of the 3/4 pine, cut it out, then trace the design cut on another piece of 1/8 ply, cut it out. Then glue the smaller piece to the "top" plywood and the bottom plywood to the 3/4 pine. At the end I would have a small box shaped like a heart, teddy bears, etc. To finish I would paint it a flat color and then tole paint the face of the box.
Then I decided to get fancy. I was cutting butterflys and had the box walls less than 1/16" thick; broke three in a row getting them out of the saw; as soon as I removed the center waste piece I crushed then with the lightest finger pressure I could apply. I had to quit scrolling for several months or I felt I would have taken a maul to the saw.
Lesson: Know when to say when. Keep it fun. Don't put yourself under time constraints until you have a better understanding of how long it will take you to complete a project. Pushing yourself because " I HAVE to have it done by X" rarely ends well.
2. turning square corners.
a. When you get to a corner, back the blade up slightly (1/32") turn the piece 90 * and match up to the line (if the corner isn't square, come back after the waste is removed and clean up the corner by cutting 180 * from the original cut.
b. When starting the cut drill the hole close to one of the corners, cut to the corner keeping close to but not on one of the sides. Back the blade to the starter hole, turn the piece 180* and back the blade up to the corner, then start cutting the pattern. If you need I can have my son either take some pictures or a short video of the technique.