I'm quite introverted and rarely feel the need to spend time with people. However, I care about my friends and try to contact them regularly to find out what they are up to and to suggest we meet up if I haven't seen then for a while. However, I find I worry about whether I'm bothering them by contacting them too much, or conversly whether they think I have forgotten them as I haven't been in touch for a while etc etc. Is this normal? Is it a self-esteem issue? How does everyone else decide when to give a friend a call or arrange a meet up?