Alone doesn't mean that you're a loner. It doesn't mean that you're pathetic, it just mean you're strong enough to take the courage to be independent.
I find that being alone is nothing wrong, especially shopping, eating, being in the cinema. Maybe sometimes, not all the time for some people, but for me it's an anytime-fine-thing-to-do.
At least, when you're trying on clothes and those clothes can't fit you, you won't feel embarrassed. And that when you try on a shoe, nobody will tell you if it's too tight and that your toes are visible as if you don't know, as if you yourself can't feel it or see it. Fucking annoying. Nobody will laugh incredulously when you tell them your feet are size 4/5, and telling you're size 6 instead like you don't know that for the past 18years.
You get to walk how fast and slow as you like. You don't have to wait , or at least make people wait for you when you wanna stop to look at something. It's a totally free and light thing to do. No burden, no humiliation, to comments, no nothing. It's just a day off with "yourself".
When you're watching a melancholy and sad movie don't need to worry people seeing you cry. You can totally cry your heart out. I know if you're watching a comedy movie nobody will laugh with you, well then laugh with the crowd.
If you order a lot of food and finish them off, nobody will remind you that it's fattening and that you're gonna gain weight. No need to share your food with anyone."PLS FORGET ABOUT SHARING IS CARING" And if you can't finish them instead, no one will say you're wasting food. You can always take away, h-e-l-l-o?
Sleep alone, no one will take away your blanket, or fist your face, or take 3/4 or even 4/4 of your bed. You get to snore and roll around as you like.
Working out alone, can go on our own pace, coz we know how far our stamina can take us. Why needa let the better ones show us how good they can do it, or worse, wait for us if we're slower?

Maybe turn it around to another point of view..
Shopping, eating, watching a movie, sleeping and spending time with your best friends and lovers or perhaps family can be fun. Making fun of your besties but no hard feelings are embedding in between. Calling each other cow for those who can eat the most. Laugh and cry together like pigs. Slamming to each other's face during sleeping after a slumber party or a masque treatment or whatever shit your can think of. Run like an athlete to show off when there's hot guys around.
Maybe that's for you. But I don't have that kind of moments yet. I want it too coz I'm not a loner. I just find doing things alone isn't that bad. People should practice it more often before they found the moments that I too, long for. Maybe in that way you'll appreciate more on the both sides, either with or without companions.