I think you are being too hard on yourself. There is definitely a learning curve with any change in machines of every type. Enjoy the experience of getting to know your machine. Do not, I repeat do not be afraid to adjust the tension, that is how you get to know your machine and are able to run it optimally. I notice you have dark thread in the top and light thread in the bobbin. Nearly every machine on the market has to be adjusted to be able to get a "perfect" stitch with this contrast, many never attain it. Most longarm quilters always match the top and bottom thread for this very reason. I would not get very much work done if I had to spend an hour adjusting tensions for contrasting thread in top and bottom for every quilt I quilt. All that being said I am sharing a link for Jamie Wallen's YT video on adjusting tension. It works for about every machine and many quilters have had lots of success using his method, I know I did.
https://www.youtube.com/watch?v=Q1mRhcquZTM