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Hi,
I'm sorry that your going through such a difficult time in your life. I do know that from personal experience that it is really difficult to make friends especially good ones as an adult. Your moving to London? I've read on the internet that there are great resources for mental health. I live in the States but over the years when I would do research for myself I would discover that there are enormous agencies, so your moving to a great place.
When possible try looking into some. Do a Google search. Call the crisis line as well in your area.
Try volunteering in something you like. Take up a hobby. What is it that you like to do? Find out if your unsure theres lots to do.
I wish you all the best.
And don't worry, your alright it's that you haven't met the right kind of friends that are a good fit. It seems like so many other people are so insecure & just don't know what they want and that includes what kind of friends they want in their life. It will get better.