The key thing is doing what works for you, not what you feel forced to do. You're right to ask the question because Valentine's Day is this weird mix of an actual historical tradition (the whole thing with saints and love letters in the Middle Ages) and a modern commercial machine. Shops clearly take advantage of it, but that doesn't mean you have to follow along just because February rolls around.
If you're in a relationship and you both want to do something special, it doesn't need to be expensive or conventional. You could do something personal, a nice dinner for two, write a letter, or just not do much and talk to your partner about whether you're actually into it. What matters is that you're on the same page, not doing what everyone else does.
Honestly, the couples who handle it best are usually the ones who joke about it together and decide together if they feel like it or not. There's no universal obligation to spend more money on February 14 than any other day. If you think it's too commercial and forced, that's a totally valid signal. That said, if your partner really does care about doing something, that's a conversation to have - but without any guilt trips.