Can you define loneliness?

Do you think that we all should be at least a little lonely?

Is loneliness good or bad?

I have been feeling quite lonely lately. I have many friends, more than I ever had but I don't really think that I have much in common with these people. I always think that if I would get myself really buisy, If I would crash on my bed with exhaustion at the end of the day then I wouldn't think about it much... I could be very wrong

Guess I need a loving partner, loosing one brought me here in the first place. But then again I don't think that this is something that you just go out there and find... is it normal to always feel a bit lonely?