I don't really think music is about playing whatever you feel like. There are so many standards and conventions in music that you have to start somewhere. Before you break the rules and create your own style, you have to master one or more IMHO.
The fact is that there's an almost unbridgeable divide between metal and modern rock. Metal musicians use a lot of techniques that are rarely if ever used in modern rock and vice versa. Metal evolved out of rock and became a different kind of music.
Of course, there are a lot of cross-genre influences. Early thrash metal bands took a lot of influence from The Ramones, but they were still metal. Similarly, gothic rock bands like Atriarch took a lot of influence from extreme metal, but they are still gothic rock.
What I'm trying to say is that genres are a necessary evil. I think of them more as references & guidelines than molds to fit into. Since I've only resumed playing guitar for a few months after a decade, it's natural for me to try out different styles and & see how well I can do.
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