Hi "lovable", I'm really sorry you're finding things so hard but do you think that maybe you're trying/hoping too hard. I really can understand that need for a connection, that feeling that there's an empty space.........but perhaps if you could think just a little bit more along the lines of "if it happens, it happens......"? Because there's nothing at all to say that it won't, at some time.
Maybe then you're going to be moving more towards enjoying things/activities just because......maybe feel a little less lonely, depressed, as if you're just waiting (?)........maybe notice a bit more of the world around you??
And when you're noticing a bit more of things around you, feeling more relaxed/content/confident in yourself, you may also notice the opportunities to connect with different people a bit more? e.g. by chatting to someone in a queue, by starting a conversation with someone at another table in a cafe/pub.........now just one of those interactions may lead somewhere......but if not what have you lost? In fact you've kind of benefited from the social aspect, so all good regardless.
And you know that a lot of relationships aren't necessarily going to kick off with the "chat up"/"getting to know" you bit anyway, a lot can start of casually e.g. chatting leads to talking, leads to more interest and all that. With friendship sometimes in the middle of that.
But as for hobbies maybe look for more/different ones, think "outside the box" for something that may have that x factor (something unusual or something just more you). Might interest you a bit more if you linked in with a friend for it/them though??
But anyway, 31 really isn't that old!! Really isn't!! And if you think you've probably got more maturity and life experiences now, when you do find a relationship it might well have a better chance of working regardless.
So maybe relax, try to enjoy being you, and the future.......well who knows!!
Alison