I hate when people burden me with their personal thoughts and problems?

Like when they feel the need to share too much information or get too close emotionally or like they are trying to force connections when we aren't close - it just feels annoying and exhausting. I put on a friendly face though because I don't want to be rude or make them feel bad but predictably it just encourages them more Sometimes I feel like Im a magnet for this sort of thing; I prefer to keep things light and not too serious most of the time.

Any ideas on how to deal with this, preferably from people who have actually dealt with this type of issue before?