Being delusional is generally harmful. Being positive is usually helpful. The difference between the two can be subtle. Try to use the grey zone between the two to your benefit.
There are a number of published psychological studies that show that if every day you write down the things that you’re grateful for, you’ll become measurably happier, your blood pressure will go down, and you’re less likely to become sick. There are huge benefits to being positive.
There are times when it’s clearly delusional to believe that a girl likes you. If you ask a girl out and she says no twice, the odds are she doesn’t like you no matter what her excuse is. The first no could be a result of extenuating circumstances. The second no should be absolute confirmation. Move on, ask another girl out. In this age of sexual harassment claims and date rape charges, no must ABSOLUTELY mean no. You may not think you’re being scary or too aggressive, but you really can’t be certain of what she’s thinking and you DO NOT want to become an inadvertent rapist.
There will be plenty of times when there isn’t enough information available to know if a woman likes you or not. In this case, there’s absolutely no benefit in automatically assuming a woman doesn’t want you. Try not to fill your head with unproven, unnecessary negative thoughts.
Until she says no, assume she’ll say yes. There’s no downside to looking at the glass as being half full. Unless there’s irrefutable proof to the contrary, let yourself believe you’re attractive.
Every woman who hasn’t said no to you can be viewed as a woman who wants you. You may be wrong, but what’s the harm? Try an experiment when you need your spirits lifted. Walk down a busy street and say to yourself, ‘She wants me’ every time you pass a pretty girl. A smile will soon come to your face and eventually you’ll have to fight to keep from laughing. You may be incorrect but you haven’t harmed anyone. There’s nothing wrong with boosting your mood with a bit of harmless positive thinking.