I am an only child. I've heard that only children tend to have a harder time making friends, but I'm not sure that's true.
I am not any only child because i have one sibling but I have also heard they do have a harder time with friendship. 
From my experience, it encouraged me to actively seek out friendship more, so I became more skilled at conversation and meeting new people.
Only child
An only child is a person with no siblings, either biological or adopted. 
Children who have half-siblings or step-siblings, either living at the same house or a different house - especially those who were born considerably later - may have a similar family environment to only children, as may children who have much younger siblings from both of the same parents (generally ten or more years).
Overview.
Throughout history, only children were relatively uncommon. From around the middle of the
an interview with Colin Petersen at the time, the group was unable to play any live gigs until they added two new members. The spectre of Colin's Bee Gees' past was making the task of recruitment even harder. "I've just auditioned my 200th applicant" he groaned. "People are assuming the new group will be a carbon copy of the Bee Gees. I must have heard "Massachusetts" 50 times. I am still looking for a good lead guitarist and a pianist to finish the line-up