LIT, I experience the same thing all the time, I've always been shy, at parties or social events I'm the one who sits back and watches others talk unless someone strikes up an interesting conversation with me. I've been horible with the small talk, always have trouble keeping a dead conversation going, or just starting one. And yes I have been thought of as snobby and stand-offish. interstingly the one thing that has helped me more than anything with this is my job, jI work in the meat dept. at a local grocery store, which requires customer service.... due to some bad shops and overheads decision to put a major emphasis on helping everyone as much as possible, I had to start greating every single person that crossed my path. With secret shoppers making trips into are store more often than not, I reluctantly had to comply. though I am not yet super confident and striking up new friendships with complete strangers all the time, it has gotten me comfortable with something rather alien to me.
So basically from my last 3 years at this job, and what I've learned with myself in this peticular battle, my advice to help you...
-force yourself to say hi to strangers, as often as possible
-as mentioned before (in other replies) volley the conversation back, even if the conversation isnt relating to you that well, manipulate it, make it into something you both can relate to and discuss
-learn about them, ask them about stuff, talking about yourself and not asking questions tends to reinforce peoples thoughts about you being snobby, false as that may be.
this last one I dont know if it realates to you at all but it may help anyone else
-don't drink, don't smoke pot, don't do any drugs...now I'm not saying never (well there are some that should never be done) but habbitually, once you get dependant on the chemmicals, when you dont have them, it tends to make you anti social, grumpy, just not pleasent, or easy to have a real conversation with. for me this happened with pot. And I wasnt smoking and then trying to go talk to people. it would smoke after work and when my school work was done, at night when I was at home watching tv, playing video games, what have you but every single night. at first you dont realize just how much this can affect your daily life, but you get to the point when it no longer gets you high, it just brings you back up to "normal", and then when your out durring the day, you are well below par, cuz you just dont have that chemical, that feeling you depend on, (now I know pot isnt really a physical addiction, but, well I have gone through more severe cases with worse drugs and alcohol, I just dont want to delve into that). any way so if your gonna do anything do it on occasion,
well thats all i got right now, its hard for me to really give advice when I'm still struggling with it myself, but I have improved from where I was.
hope this helps
Ellissa