There were MANY people who didn't believe in me, most of them I simply cut off. My parents were always supportive, especially when I started at 19 and they saw how responsible and serious I was taking it. I'll never forget cashing a check one time with my dad (I was like 20 at this point and it was during the holiday) and he was ASTOUNDED when I cashed a check for $1200, this was with me making $8.24 at the time (worked HELLA hours) after that nobody in my immediate family had any doubts.
You should definitely do what you
A). Have a passion for, as that passion is what's going to carry you through the 50 hour work weeks, the challenges of maintaining knowledge of newer and increasingly complex products, keeping your sales goals up, and dealing with different people and personalities day in and day out.
B). Are Good At. Not everyone is cut out for making an actual career out of retail. There are certain politics involved and networking needed to be able to move up. You have to know the trajectory of the company, what they are going for with the business, and how you can in turn be ahead of the curve in providing that. As you continue to move up and become a Manager you have to have the foresight in hiring the right people for the right positions, be able to properly train, coach, and hold them accountable, and effectively LEAD them.
The key is ALWAYS to believe in yourself, even when it feels like no one else does. You can look some of the ignorant, misinformed, and downright retarded opinions spewed by some of the posters in this very thread who don't know anything about the money that can be made or the relationships that can be forged by working certain retail jobs. If you apply them to people in your actual life who will look down on you, it can seem like a pretty daunting thing. If YOU know what yo stand for and how hard you are willing to work, then fukk everybody else and their opinions. My ex had to learn the hard way that I am NOT someone to doubt or lose faith in when it comes to my career. Your parents will in turn see, as you continue to grow and progress within your career, that they were mistaken, and they will be proud of you, but most important of all you will be proud of YOURSELF