I'm not really that good at writing music but I like to make it anyway. I've been using GarageBand for instrumentals and Notes for lyrics. I don't think it'll amount to anything and I sometimes wonder if I took music theory classes, which I don't want to take, whether I would get better and whether it would be worth it. Basically what it boils down to is "do I want to waste my time doing something that will help in the long run but that I really don't want to do and that I don't need or do I want to teach myself and get better agonizingly slowly but have a lot more fun doing it"
news flash.... the fact that you "don't want" to learn "music theory" is a sneak preview that you are not going to learn it if you expect someone else to teach it to you. that's just the nature of "music theory" and/or ... the nature of learning in general, i think! you can't just go to the doctor and get a 'shot' of 'music theory' and know it. besides ..... it doesn't really exist!! the way "music" "theory" (if there is such a thing) works is .... it's really just how you choose to make sense of the musical world you live in.  Every "music theory" class really is just an extrapolation of what seems to be the principles among a CERTAIN SET of music that was popular during a certain time period.  If you go to a classical school, they will teach you things that relate to what was popular in europe several centuries ago. if you go to berklee, they will probably teach you a lot about what was popular in the 1940s. there could be a class based on only the last 20 years of music, and it would be different still. there is really only a small amount of stuff that is really actually established and unchanging. like note names -- europe named the notes with letters a few centuries ago, and it really stuck. the entire world uses those notes. do you know them? (A, Bb, B, C, etc)