How can I 'reveal' myself more to people through facebook etc

Ok so bit of background history im in my late twenties, never had social life/relationships etc always been seen as extremely quiet and very private/preferring to do things on my own. I do enjoy being social sometimes I love going to gigs for example but its usually been with family lol as Ive never had friends to go with. I made a facebook account years ago to try and catch up with people I knew at school but most don't seem interested in talking/meeting up they just said they remembered me as very quiet so they never really knew me even though I might have hung around with them now and then. I don't think it helps that theres nothing on my facebook page, just a picture of my dog. Im really self conscious about what people know though. For example someone put a pic up of me and my judo team and because it was the only pic I deleted it as I didnt want people at judo thinking (or knowing lol) I had no friends. I would rather them think that the reason I had no pics of me was because I deleted them and didnt want them on, as opposed to them thinking no one has 'tagged me. I think that now im nearing 30 I need to change because ive just wasted my youth really. Ok so Im and introvert and prefere to be alone and all that but Ive never experienced a social life. In real life people cant relate to me because they are married with kids..Ive never even had a boyfriend. Then again I told myself this 5 years ago but nothing has changed. I know facebook isnt the be all and end all but Im sick of seeing other people posting pics all the time about the same thing while im too self conscious to do so. Im kind of like my mum she made an account using a false name but wont post anything on at all, she uses it to spy on others. She can get away with it though as her generation didnt have social networking sites. Id like to reveal myself a bit more through facebook but find it hard im too embarrased. I dont have any pics with 'friends' though for obvious reasons, I dont have them. So Im wondering what sort of pics will make me seem less weird? Heres the main question I wanted to ask... with my account having nothing on it for years wont it seem weird if I suddenly start posting as much as others and uploading pictures? How would you go about this? Would be like a sudden change in personality. Just wanted advice..

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