I went through the same sort of thing as the odd one out.

Once at a family function with my happily married siblings and their kids, my 6 year old neice asked "where is Uncle Ian's woman" well Uncle Ian didn't have one but he certainly wanted to be with one.

However BCG you have to be true to yourself and you are not at a stage in your life where you want to be or have found the right partner to be in a LTR.

So counter the odd man out feeling by thinking that you are making sure you that you find the right person.
The consequences of not finding the right person are awful. Some of those friends will be divorced later in life

Getting divorced is the pits and it is due to many things but being overcome by romantic notions and physical attraction without really looking deeper is a major factor in picking the wrong person

Sobering thoughts aren't they