It seems to me the London is more popular than Queen's gambit.
Openings I want to use but they’re too popular

I beg to differ on the King's Gambit being popular. Maybe it's just me, but if the opening explorer page is to be believed I've only played against it 3 times.
That, and just because an opening is "popular" doesn't mean it won't work well. For example (again, according to the opening explorer), here are my stats with the Sicilian Defense:
White: 54% Win / 8% Draw / 38% Lose
Black: 55% Win / 4% Draw / 41% Lose
My stats with 1...e5 in response to 1. e4 are also...not terrible, I suppose:
White: 57% Win / 43% Lose (apparently I've never had a draw with it)
Black: 52% Win / 3% Draw / 45% Lose
These openings have existed for a long time, and they're played often at all levels for a reason. Never let anyone bully you into not playing certain openings because they're "too common."
I wanna try to play the queens and kings gambit, but I don’t know how effective it is considering everyone learns these openings now as it is very popular. Should I still learn and play it or should I learn a newer opening?