Ever since I was in kindergarten, I would go home and draw or paint for hours after school let out. Eventually art took over my life and I was torn between going to art or design school. The thing that became my determining factor was that the uncertainty of the art world scared me too much haha but now that I've graduated I've starting picking up painting and embroidery as a hobby again.
Own your mistakes; everybody makes some kind of mistake along the way, and nobody is going to hold it against you.
If you want the results, you have to put in the work!
If you're feeling uninspired, get out of the studio and go into nature. Even if it's just for a few minutes, it can work wonders.
People may try to imitate your style or work; don't let this get you down, if anything take it as a compliment! Unless it is really plagiarism, then call them out to their face haha.
Perfectionism is never a problem, and don't let anyone tell you otherwise.
Augmented and Virtual Reality is going to be (if it isn't already) the next big medium for design, and I plan to adapt by embracing the technology to create design in that fashion as soon as possible.
Utilize the internet/social media/creative networks. We live in a digital age, and you and your work can be at the finger tips of literally anyone from all over the world! Put yourself out there, and really try to create or find a community that can work for you and your goals.