Re butterfly and caterpillar; it is disingenuous to imply they're 'the same', as implied in the relationship is the notion of evolution of state. That is the premise on which this analogy is most commonly used in spiritual teaching.
OP, really, there are no 'other people' for you to feel separate from.
To start with, try switching up to experiencing 'others' and the reflections they offer of your own awareness, as teachers in the moment, and connect with a sense of gratitude for the service. Or not! It really doesn't matter.
If you can't initially find ways of connecting to the inherent spirituality of other people in your day to day experience, place yourself contexts where it is made easier: depending on what you feel you need and what you are able to logistically make happen, I would thoroughly recommend integrating your sense of spirituality in a social context by going on retreat. Or a few weekend residential workshops. A mixture of experiences which really enable you to compassionately explore the nature of mind and awareness, such as Vipassana or Zazen, as well as trying some practices which ground spirituality in the body; yoga, ecstatic dance or other movement or breath based work. There are also lots of opportunities, depending on where you are in the country, to experience spirituality through nature, which could be said to be the greatest teacher.
Developing some kind of practice of your own, whether it be morning yoga, a daily constitutional walk, tai chi, silent sitting meditation, chanting or 'mindful' washing up -it doesn't really matter how long or short, or even what it is- and paying close attention to the fluctuating thoughts, sensations and feelings which arise (all of them: virtuousness, smuggery, ache, resistance, relief, feeling distracted, impatience, itching, boredom, comparison, needing a wee, insecurity, gratitude, feeling hungry -whatever, none are better or worse) as you approach and engage in the daily practice, is a great device for anchoring your experience in your daily life.
If you have broadly Buddhist leanings, there are some great teachers of advaita offering group sittings (satsang) either online or in person, where the invitation is to explore the nature of mind, presence, awareness and the human experience in what is often a very warm, inclusive and humorous way through Q&A, silence and discourse.
Put yourself in the way of experience in order to cobble together a little network of people you feel connected with and stay curious and honest about how life appears in your consciousness, whether alone or in a shared social context.