Im i the only one to feel alone?

Im 14 and my parents divorced when i was around five and my mom got cusditoy of me a and my sister. My mom side of the family favor my sister over me even though shes bossy and rude to everyone. My dad is really nice and helpful to me. That being said i cant help but feel alone like its just me and my thoughts most of the time. This doesent make sense to me because i have plenty of nice friends and what not... Im just asking if theres something missing in me or something owell i dont care if people dont answer because its nice to get this out here and not trapped in my mind, so any advise?