How do u turn feelings off?

Basically I'm in love with this girl (first real love) and there isn't any sexual tension so it isn't gonna work. She says she loves me but i know it's as friends, this is all fine. The problem is that everything i do makes me think of her, this makes me smile and then i get this lonely feeling. Now I've felt lonely most of my life and between u and me, 'wispers' I don't like it. It's annoying and it makes me feel like shit. The only "cures" i know is getting smashed with friends or having a shag with one-time friends
How do u turn feelings off?
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