An introvert's tips on people problems. (Not the nicest tips but true to an extent):
1. Worry less, you'll be happier. If you worry too much you might make the situation worse.
2. Care less. Don't put yourself in a situation where you think you can fix it when it can't be fixed.
3. The less friends you have the less problems you'll have to deal with. Some people might drag you into their problems that you just don't care about.