I'm seeing a lot of motivational posts lately, and thought I'd post mine! The earliest they are is 2015 where I drew on dA muro with a mouse, and then to Photoshop with a tablet!
Just keep practicing! If you're not happy with your work, don't quit! Just keep going! Break out your comfort zone, and try new styles!
And if someone tries to bring you down and crap on your work, ignore them! You are unique! Your style is YOU! Do not change for anyone, except yourself! Be true to you!