I went on a website called City Socialising (www.citysociasling.com
) which is made for exactly this reason. To be honest I didnt really get on with it and didnt really find that I 'clicked' with any of the people there, but I did have a good time on the socials I went to. I think it's just the luck of the draw who you meet. Definitely worth a try.
Aside from that, hobbies I suppose. Do you have any hobbies? I think it's probably the best way to meet people because then you know you share a common interest.
I'm not great at making friends either though, so probably not the best person to ask!