How to deal with my painful knees

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Hi guys, I have been tortured by my painful knees for years. At that time I worked in a school near the sea and I wore high heels everyday to work and walked up stairs (you know although I am quite tall, I needed to wear high heels because my students are much taller than me...the feeling would be quite strange when they look down and stare at me like I am the kid. Wearing high heels can help me to build up a sense of authority). But one day when I was ready to got off the bus, I suddenly couldn't move at all because my knees was very painful. Then I visited a practitioner and he gave me some herbal medicine to apply on my knees. It did relieve the pain a little bit but the situation become worse these years. I always feel painful, especially on rainy days, that I can hardly stretch and bend my leg. I dare not to go up and down stairs also. I told friends about this situation and they didn't believe me at all as it usually happens on more elder people. They teased on me and I feel very desperate. I am just 23 years old and I don't know what to do to relieve the pain. Do you guys have the same situation? What do you usually do? Any good tips?