[MindBomber]

The use of foundation is not the issue; it is your complete lack of self-confidence or commitment to beliefs, and having a Girlfriend and Friend willing to break your trust and mock you.

A person who is seriously interested in you would not allow minor issues with complexion interfere with a relationship, and any girl who would isn't worth seriously pursuing. The willingness of your current GF to mock you, and to proceed by encouraging your "Friend" to join her makes that abundantly clear. If wearing a touch of foundation makes you feel good, do it. If someone notices, tell them. It's your business, your decision, and should be no one concern of any other person.