Hi there - i am a bit like you and i had my first training night last night with a local running club. They were really friendly and made me feel welcome. They had a chat with me regarding my ability and goals. There were quite a few runners there of all different abilities and i was grouped with runners similair to me. It went really well and i have the bug. Even went for a pint afterwards !!!
Use the forum or click on clubs tab above and see if you can get a running club rather than an athletic club. Running clubs tend to be less serious and social.
Go for it.
