When it's time to get a job your degree is generally vital to show what you can do, what you know and even who you know. Once you get into the game as you are now, it's very rare that any of your colleagues will even know who has what degree. Most companies have a policy of offering promotions based on skill, ability, and attitude.
I personally don't think you should concern yourself with these thoughts; get on and get confident. One last thought: Keep reading so you have learned as much as you can from current thinking rather than a degree you may have done 10 years ago.
All the Best,
Brad Sugars is the founder and chairman of ActionCOACH. As an entrepreneur, author and business coach, he has owned and operated more than two dozen companies including his main company, ActionCOACH, which has more than 1,000 offices in 34 countries.