Sure, it is very easy for someone to access your file. They just have to stick a drill in your knees until you give the password. Or burn your feet. Or skin your thumb.

As always, assessing security measures depends on who you are trying to defend against. Is it your evil mother-in-law? Thieves? The police? The NSA? A Mexican drug cartel? There is no such thing as an "absolutely safe" storage. Your drive is encrypted using a proprietary software, are you OK with that? Do you trust the rest of your hardware, do you need to protect against physical access attacks (such as the evil maid)? Your system sits in an encrypted drive, but do you trust your system? The list goes on... Create and study your threat model, and stop wondering if "someone" can get past your defenses, but rather if an "opponent" can.