Hey, IT - nodding to people is very safe but if you want to get to know them better you have to speak to them. this is not easy for some people. so, you do it gradually. start safely with comments like: nice day! move up to: how are you today?! and keep building. ask people for their names. you might not end up as best friends but you will make a better impression and improve your self confidence and gain valuable practice to meet others. you have to look at it in stages of progress. i hope this helps.