Is my music that bad?

So i have been writing music for the better part of the last 15 years of my life, and have upload loads of them on youtube. I also have one of my digital (incomplete) albums on sound cloud. Back in the old days my quality was bad, but i got better at it with every video. Nowdays i do high quality music, at least when it comes to the classicals i am writing. I have been promoting myself through my facebook page and fb profile (even tried paid promotion there), instagram, youtube, soundcloud, tweeter, Reddit, through challenges of big youtubers like Davie504, but i don't seem to gain crowd ... And every time i upload a song, i end up crying because i don't want to accept that my music sucks that much, but it seems to do so ... So my question is... Is my music that bad or am i bad at marketing? It's getting too tiering to try without feedback... Should i just... Stop? Why is my music so unpopular? Here are a few examples of my better ones: (should probably go to YouTube to listen cs for some reason yahoo drops the quality a bit)

https://youtu.be/c0Cu7qee2GA

https://youtu.be/bSxgzSQu1G0

https://youtu.be/5rHjIoCaQpw

https://youtu.be/tGotWJvTSHM

2017-04-11T00:37:33.809Z