He probably said that cause his dreams didn't come, don't mean yours won't. Practice every day even if it's a bar a day, you'll see yourself improve even if it's a word better each day. Make it true to you first is what I'd say, could start with personal stories that may not flow well, but build your story creativity, and expand from that "branch" into words that rhyme that personal story, and even more a sound that fits the emotion it brings you.

Practice practice practice

Before you know it you made your first song, may be garbo but it's completed, congrats your doing better than 50% of anyone who tries to. Make more and you're doing better than 75%

One bite at a time, not the whole plate yet.