I and my fellows - Whether she meant the young women of her own acquaintance, or those who had been consecrated to God in the same way, though on different accounts, is not quite clear; but it is likely she means her own companions: and her going up and down upon the mountains may signify no more than her paying each of them a visit at their own houses, previously to her being shut up at the tabernacle; and this visiting of each at their own home might require the space of two months. This I am inclined to think is the meaning of this difficult clause.
Bewail my virginity - To become a wife and a mother was the end of existence to an Israelite maiden. The premature death of Jephthah‘s daughter was about to frustrate this end.