Everyone seems very happy on social media, why do I feel this way?

Honestly, seeing everyone’s perfect lives on Instagram or whatever has made me feel cold about my own life. Is no one unhappy? I don’t get it; am I the only one who feels like I’m hitting rock bottom? I really don’t like what I see when I look in the mirror—I’m having a total confidence crisis. It’s like everyone else is achieving something while I’m just standing still. How do I get out of this situation? Please give me some advice.