This isn't something you can 'accept as your lot', any more than, if you've not eaten peas for 10 years, accepting that peas will never happen to you again. In the same way as deciding to have some peas is a case of 'Go to the shop, buy peas, go home, cook peas, eat peas', deciding to find new friends is something you go out and do, not something that just happens to you. It might happen on it's own, sometimes, just like you might order a meal in a restaurant and suddenly realise 'Ooh, I've got peas, here!', but generally, you have to go and do friend-making activities.
It's about not focusing on making friends, though. Do a course you'll love, whether you make any friends or not. Join a club you'll love, whether you make any friends or not. Make yourself a regular in a cafe that you'll love, whether you make any friends or not. These things filter people into those who have at least one thing in common with you.
Above all, stop seeing yourself as a victim of circumstance and start creating your own circumstances. You're in charge of whether you have a hundred friends, no friends, or something in between.