Some corrections: A lot of people would rather stay single because they're tired of giving (their) everything and ending up with nothing. Their is optional, but it's probably better without, or using 'up' instead. Did you have a question?

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is true but you need think that someday find you this person and will be worth everything you went through before... Is my form of think, you imagine live all your life alone?

In my opinion, its true but its not the right way think about it. Cuz those people dont really understand what love really means. If they really feel that they end up with nothing, they just are kids. At least, they gave their own love to the lovers, end up with experiences and grown-up. Dont stay single to be a coward.Try to find and you'll feel the beauty of love.