Hi i am virgin.sometime when my penis is fully erect it reaches 7 inches in length however majority of the time it is around 6.06.3 inches.i wanted to ask that when i will do intercourse will my penis reach 7 inches or will it be around 6 inches?

when you are aroused enough to have intercourse you penis will be 7 inches or greater . During arousal blood flows into the penis and remains their until you ejaculate then return to its non aroused size

Size of the penis is frequently incorrectly measured. The sizes you mention are all sufficient for sexual intercourse. Pl dont get hung up on size- you will be fine