I prefer travelling alone. Now my trips are 2 weeks in length so nothing massive. I did back pack Europe for 4 months on my own and loved it. For some reason the only time I feel lonely when travelling is when camping alone. Not sure why, but I have given up solo camping some years back. Camping is a social thing for me and love camping with friends. I enjoy the random conversations that happen on trips, new people that last a brief moment and then are gone. For me getting a way on my own is the only way I truly unwind, hit the road with no schedule but my own.