How can you get over loneliness?

Is it possible to be around couples and not wish you were in a relationship? Or on a date and not think how he will propose to you? Can we transition from dating to being single and not having anyone to snuggle flirt with.

 I always felt as if I needed a guy to validate my existence.  I feel like I've grown to be pathetic! I want to be loved desired and cared for. It’s frustrating knowing I'm only a body, something to be used and abuse. But is it me that has allowed it to be this way?

Can I overcome the desire to be held, loved, and wanted?? I'm growing a sadness that can't completely go away with positive thinking. Yes I've told myself I'm happy and tried to show that, but I can flip that emotion at anytime. Things aren't easy when you desire something you never had. I wish things could end in my favor but idk. I honestly need to come to terms with my loneliness.