I wanted very much to be a nun and entered monastic life pre V2 and then again many years after The Council. Finally, I had to conclude that I simply did not have a vocation to monastic life. I left monastic life both times through personal choice to do so. I had no attraction whatsoever to an active order nor to marriage. The eremitical life (hermit) and Consecration to Virginity back then was not in favour in my diocese anyway, not that I was really attracted. I had no attraction to third orders or any other organization within The Church, despite trying to rouse up some sort of attraction for something or other organized and I made many enquiries, did much research and praying. For a long time, I felt completely at loss and used to say to myself that I keep knocking on the Employment Office Door of Heaven, but no one answers!

Finally, I made private vows to the evangelical counsels (after a priest who knew me well and directing me affirmed that there was indeed such a thing as private vows to the evangelical counsels. I had not known that there was and asked him quite hesitatingly!). My vows are now of some 30 years or so standing and with joy, happiness and fulfillment - with the usual life challenges etc. here and there just for some colour. My overall journey at times has had major challenges however as probably most all lives do. I live quite happily alone and am involved in works of Mercy in the Church part time. However, I would strongly advise anyone considering their vocation in life (or undecided about it) to seek a good spiritual director.
Spititual Direction is needed certainly if private vows are embraced and to do so only after sound spiritual direction, and to maintain personal face to face contact with a good spiritual director for the life of the private vows for sure - my private vows are now for life with spiritual direction face to face on a regular basis. The very intrinsic nature of private vows, to my mind I have concluded, is that it is a truly quite hidden way of life in the laity in the midst of the general community and in The Church.
The reason I finally spoke about my own vocation on Catholic discussion sites on the internet is that there seems to be growing interest in it including whether it could actually be a call and vocation from God in the first place. It is and one is quite conscious of it as a call from God to a specific way of living, although it is probably rather rare.
One certainly could be called to live the single life without any vows. Again, I would not do this without spiritual direction. There is the single life that is a call and vocation - and the single life or state that is transitory pre a call to some other vocation. The single lay state with or without private vows is a call to the celibate state - for the sake of The Kingdom. A radical commitment to The Gospel.
Certainly, private vows to the evangelical counsels in the laity and the single life or state are all states in life that of their very nature remain open to a further call from God to another vocation.