A lot of good and sincere answers here, and I hope adding this one will help somewhat. It is true that comparing yourself with others the same age will initially make you feel sad but don't let this discourage you from responding positively. You are still only in your 20s and young, strong and still very early, if on a potentially 100-year old path. Perhaps it's now a good time & opportunity to discover yourself, partake in some enjoyable and meaningful activities / exercise / volunteer / travel and also develop & maintain excellent relationships with a wide variety of people. A wise man once said: "Endurance is the key to success. True resilience requires a flexibility that allows adaptation to any condition, while still remaining true to the core. Can you maintain your integrity under any circumstance?" 加油, stay strong, happy and healthy! Trust that it will all turn out well!