If you dream of sitting alone somewhere, it doesn’t matter anywhere, it might mean you are wondering about your identity and sense of belonging. You dreamed yourself seeking solitude because you feel comfortable in the quiet.
If you dream of sitting alone somewhere and this situation is not of your own doing, it means you are being outcast. You do not belong with anybody, or with groups in society. You feel lost.
If you dreamed you were sitting alone, and waiting, it means you are at a crossroads in your life. You are indecisive and waiting for something to happen.