sad/lonely....out of nowhere?

Have you ever felt lonely or sad...and can't explain why....you just feel like you have no one at all to turn to...people are always going to say they are your friends but when you need mental and emotional support no one is ever to be found....I feel that way...like I'm a bother to people...I mean I don't think any negative thought...no I'm a pretty positive thinker..I'm ambitious but I don't have any friends I hang out with..or really talk to..or have fun with..feel like a weirdo smh 😔😢People would never know though because of how my personality is...