Probably most successful songwriters have an innate songwriting ability.
A guitar riff played on a piano doesn't come close to the purity of it being played on a guitar but I faked it enough to get by.
One other thing, if it's possible, as songwriters, you should also develop yourself as record producers.
I quit college. I was studying architecture for about a year.
No matter what you do, you'll never run away from you.
It's very hard to teach someone how to write a song if to begin with there's no creative crop to harvest.