The King's Gambit is fine. If you like it just play it. It's doesn't matter for amateurs like us.
Just try to mix it with other openings or your opponents might come prepared.
#21
"The King's Gambit is fine." * It loses a pawn, does not develop a piece, and weakens the king.
"It's doesn't matter for amateurs like us." * The same can be said about 1 e4 e5 2 Nf3 f5, or even 1 e4 f5.
"mix it with other openings" * Better stick to one, sound opening.
I played it quite a lot as a secondary opening, especially in correspondence/daily. It's not a bad opening, hardly losing. But to a great extent it is played out. It is difficult for white to find new plans in the KG, especially if black has even a slight acquaintance with one of the many sound defences.
For me, the biggest issue is that black has a wide choice of reasonable defences, all off which give approximate equality. Black has to know only one, the one that suits him. White has to be prepared for all of them.