Screwed myself again I guess

Every now and then I meet some girl who is strangely friendly in a public place and hours later I'm thinking I feel kinda weird. Is it a cold? lol. No, just a late gut reaction telling me I should have made some kind of random approach hours again. Went back today but she's no longer around. Another one got away. Not sure if I pulled it off in the first place, takes a lot of self-esteem out of the blue. Feeling lonely again, just sharing.