It surprises me how a musician so talented hasn't been able to write a song yet... What i find more challenging as a writer is writing about something specific just like the open mic songwriters challenge . It is hard to push it. You have to just try stop trying something specific. at least for now.
What i do normally is, i think for a while about all the stuff that i am going through at the moment, good and bad. (mostly works best for the sad sfuff in my case lol) And then maybe i realize what is the most important part of it all that i want to talk about or write about .. start playing around with some chords till i find something i like... and then at the same time try to come up with that one single sentence that will start it all . i write the lyrics and music simultaneously, but i know some people do one or the other first .. . to me it all goes together . So i come up with that first sentence.. and try to make it fit with the chords i liked and without meaning to start creating the melody . that part just happens, i mainly focus on what i need to say and go on from there.
I hope you find this helpful, however the process is different for everyone .. good luck.. and i hope you come up with your own song soon so that i can hear it!
I've been writing forever.. but started taking in seriously when i was 13.. from then on i have written a bunch of songs.. but not all of them are good or decent... but you have to keep doing it , to better understand your own process ..and to get better at it.. i don't think you ever finish learning. because you change... so your style changes and your feelings change and what matters to you changes.. so inevitably your music changes too and the way you make music will change too.
To me writing songs is very therapeutic ... like going to the psichologyst ... sometimes after writing something and hearing it over and over i realize things about myself that i did not know before, not even while i was writing it ... i think you will be good at it and you will love it! it is addictive haha!