In that case, GMRS may be a bad choice. For that matter, 2m or 70cm amateur radio may be a bad choice.I live in a valley surrounded by dense woods higher than me.
VHF and UHF signals tend to be "line of sight". As such, they will struggle to get out of the valley.
As others have said, if your handheld radio from inside your house is weak/scratchy/noisy into various repeaters, folks probably won't talk to you. It's not that they don't like you or that they don't like newcomers, it's that they don't care for signals that are hard to copy.
Set aside any pre-conceived notions about what radio service to use or what radio to buy. Figure out what you want to do with two-way radio communications and figured out who you want to talk to. That will drive your decisions.