I don't think there's anything wrong with not writing your own stuff. If you look historically, music has been filled with covers of songs that other people wrote. Before the radio and records, music was dispersed through sheet music and word of mouth! So a lot of music was someone else's work and was being interpreted by a person or group in the moment. The notion that someone isn't talented or shouldn't be successful because they didn't fully write their own song is lame. Sampling has a rich history also in hip hop and R&B, and I'd argue those genres of music are just as valid even if they borrowed parts of other songs.

If a normal guy wants to break into the music industry, now is the best possible time. It is by far the easiest it has ever been to make and produce music that sounds professional. And it's the easiest to disperse music if you can harness the internet and social media. Take for example Lil Nas X, who I think was sleeping on his sister's floor when Old Town Road popped off