Here are just a couple:
“There is nothing to writing. All you do is sit down at a typewriter and bleed.” ~ Ernest Hemingway
“If writing seems hard, it’s because it is hard. It’s one of the hardest things people do.” ~ William Zinsser
Is writing a novel easy? Of course not. If it was everyone would be doing it. But what in life (that is worthwhile) is easy? Quit whining.
If you don't like how solitary writing is, find a critique group or a class or a writing partner. Not that they will sit with you while you're creating, but you have your characters for company when you're writing...be engaged with them; they're fabulous! If they're not, you can change them, find new ones, learn more about them, have a relationship with them.
And when you need real people around, it's simple...turn to your writing community. It is vast; it's real-life or virtual, it's one person or five or ten, it's in every bookstore and on every website. If you need people they are out there and the writing community is an amazingly supportive one. Just look around.
So now, it's time to get back to your writing, and enjoy it.