It is difficult to love when you do not have anybody willing to love you.

Not always. Not necessarily. For some reason I loved one of my classmates in middle school very deeply. She was my first (and so far my only) love. But she did not loved me. The feeling of love is natural. True and deep. There is nothing difficult about feeling the love. But the fact that she did not loved me, and that she intentionally kissed another guy in front of me, and that she started to be with that guy back was painful. And the fact that she dropped that guy after the end of the school), and she started to be with another guy was weird. This was between 2007 and 2012.

I felt the emptiness and being very alone. And I felt and I feel as if this was killed a part of me. And/or partially the capability of feeling love towards others. It is difficult to explain. And I still think about her (after one decade). Probably I will keep thinking about her until the end of my current earthly life. And I do not even know why. It was my first (and so far my only) love. Probably some people know and understand what I felt and what I feel. Maybe people, who felt/feel very deep love towards someone (either towards a person or towards an animal) felt/feel the same (or something similar) as me.