Open Question: Is my BF penis small? (5 in erect)?

is around 5 inches average? when erect? for a normal male? and i when i grab it.. my fingers can touch when they go around... my finger and index finger meet when i grab around is this a normal circumference? i mean its proboly like 3 quarters circumference.. maybe 2.. it is around 2 inches non erect... im just concerned that something may be wrong with him.. ty for opionions