I am shrinking slowly. What can I can about my height?

At childhood, I was lucky for growth. I was 1.74 at the age 14, tall for that age. I was 8-10 taller than my one age older sister. Somehow, things went bad. My growth stopped at that age, but my sister continued to grow taller after that. She became 1.77, so 3 cm taller than me. Sometimes I am ashamed of this situation. After the age 30, I also began to shrink 4cm due to posture disorder. Now I am 1.70. When I get together with my sister, she becomes way taller than me with high-heels. I have a great complex with her. Also my wife is 1.67. How can I cope with? When she wears high-heel (12 cm) shoes she becomes taller than me (7-8 cm). How can I cope with it?
I am shrinking slowly. What can I can about my height?
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