Does The Penis Have A Minimum Normal Size?

hi doctor Iam 28 /m years old Im getting marriage after 3 months
I feel my pennis is very small before eraction it is only 2.5 cm length only
and diameter is only 1.5 cm only.after eraction it is become as 10 cm long and 3 cm diameter it is normal or what what should be minium size please advise I am very dissapoint and affraid to marry