I'm a loner and sometimes i do get lonely but in general it's the best way for me to function. I don't get the point of being with people if i'm not comfortable with them. There is not a wrong way to live your life, as long as you are comfortable and you are not killing anyone
If you are not with the right people it can be really lonely eg if you have a relationship with an alcoholic or something- you are with this person but its lonelier than actually being alone.