How to cope with rejection?

Every time I've gotten close to a girl, everything seems to go pear shaped. I'm a quiet individual and find it hard telling a girl how I feel, often because I fear rejection. I keep being told by my close friends how "its their loss" or "how they don't deserve me" but each time I get rejected, my self confidence drops further and further and now I'm even scared of developing attachments to girls because of this. Any advice on how to cope with rejection would be very helpful. Thank you.

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