I'm hardly qualified to do an analysis of your composition other than hearing a chord sequence that would be difficult to match a melody to (in your chosen style). If writing a melody first it's a matter of an arrangement that goes "around" your melody. Most here just use backing tracks to assist them in playing melodies or improvisations.
I'm not sure if Chris writes out a melody before doing a backing track, probably not, but he understands the tried and tested conventions for his style. The tin pan alley guys who wrote most of the "standards" either wrote music or lyrics, only a few wrote both and often the backing was done by an arranger. There were some who could only write music if they had the lyrics, and some who couldn't write lyrics unless they first had the music. No set rule as to which comes first. It’s similar with composition as to whether you write backing or melodies first although with songs it’s usually melody first.
I apologise if it seemed that I was judging you as being further advanced, but take it as a compliment as your playing is very good for someone who has only been at it for six months. Doing a backing track is something I wouldn't have expected from a beginner either.
As said I think you have a good feeling for music and the potential to be a good melodic player. While waiting or trying to find a composition course there are a few exercises that you could try that might help get your ears adjusted to hearing harmonies and simple backing. Once again I have no idea about your level of knowledge, so will make this as simple as possible:
Write yourself a melody. It should be simple, repeat, modulate (if you can) and have a climax (if possible). If you understand the scales you used in your melody then you should be able to identify the root , third, fifth, seventh, etc. (adjust for minor keys). Keep your melody as a solo and write just a Bass line that only uses notes within the scales you used in your melodic solo, especially the root and fifth. Be sure to have your bass give you the rhythm as it's the backing and you are the melodic solo. I love this exercise as it isn't cluttered and can have lots of space. Sometimes the most beautiful music isn't just what you hear, but the spaces in between. It's the inferred harmonies that engages the listener rather than leaving nothing to the imagination. A next step (if you wish to go there) would be to see if you can add long notes that don't move too quickly and aren't moving at the same time as your bass or your solo. Strings work well for this. At this stage just try to use your ears to see what sounds right. These two exercises could keep me busy for the rest of my life as there are infinite possibilities (and I’m old). Keep the form simple, but stay away from everything moving as a block movement and try to use your ears. Hear the notes you want. Beyond a bass and drone continuum you would be dealing with all the complexity of chords and moving those so that they compliment your melody, or at least give you a structured backing that allows you to make up a melody or improvisation.
Best of luck