Short answer: it could be either. Shyness usually involves hesitation about social judgement or starting interactions, while needing solitude is about how much alone time you require to feel restored. The same behaviour — avoiding a party, for example — can come from anxiety (shyness) or from a clear preference to recharge alone.
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Signs worth noticing: do you avoid initiating conversations because you worry about saying the wrong thing, or because you simply don’t want to start them? Shyness often looks like wanting connection but holding back due to nervousness, self-consciousness or fear of negative evaluation. If you’d like to join in but feel blocked, that may point more toward shyness. If you rarely feel the desire to initiate even when relaxed, that leans toward a lower social initiative — not necessarily fear, but preference.
Need for Solitude
What may be contributing: some people need long stretches alone after social activity to recover focus and calm. If you find social time pleasant in the moment but quickly drained afterwards, or you plan regular alone-time to feel like yourself, that suggests a higher need for solitude. Contrast that with someone who wants social time but avoids it because of anxiety — both may decline invites, but for different internal reasons.
Social Energy
What is worth noticing: notice whether interaction tends to energise or deplete you. If small talk and groups leave you exhausted, that can indicate you draw energy from solitude. If socialising usually leaves you buzzing and you only avoid situations because of worry, the pattern may be shyness layered over an extroverted energy style. Mixed profiles are common — for example, someone may enjoy deep conversations (energising) but dislike crowds or surface-level socialising (draining).
Reflection: take a moment to map your typical responses across these areas — do you want to connect but feel inhibited, or do you prefer fewer social contacts and predictable alone time? Many people sit somewhere between categories, and noticing which pattern fits most days is the useful next step.
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Introversion and extroversion are better understood as tendencies than fixed boxes.
Take the Am I an Introvert or Extrovert? assessment