Hi Ali,
One thing for sure you wont be a "Billy no mates", remember everyone is single for various reasons on a JY holiday and have one thing in common. They all want a good holiday and in my experience all mix really well.
I took the plunge 1 year after losing my partner and went to Americas Golden west in June last year, enjoyed it that much did Treasures of Andalucia in November. Already booked two trips this year in April and June.
Mick