I can't help thinking that whether we feel loved or not depends a lot on what impression we were given in our formative years. Some people are very loved by a number of people, yet at times they seem to question this. The people who love them never waiver in their love, yet they are doubted. It's a mindset.
I don't have a large family or really a lot of close "friends" yet all my life I have felt loved. Oddly enough, not by my mother, whom I love dearly though she is now gone; we were never close and she resented how fond my father was of me, so that always caused tension between us until he left. I really enjoyed my mother once I became an adult with a family of my own.
I also believe there are various forms and degrees of love, and of course my children and siblings love me deeply and with a strong attachment, and I feel the same way toward them, regardless of differences with siblings. Similar with my cousins, though not as deeply - there just isn't the same amount of familiarity.
I have friends that I love very much and feel a strong attachment to; and they don't feel the same degree of affection or attachment to me but that's ok! There is satisfaction in just loving someone.