What you do with your time shows your values. If you consistently try to spend your days with God then you truly believe in God and love Him. If you spend your day playing video games, talking to friends, studying, working, and doing other things without thinking about God until Sunday if at all then that shows we're your priorities are. Not that any of those are bad things but when that's what you do constantly then that must be what you trust and prioritize. People's actions show you what they really believe and if you're struggling to see what you believe in then take a look at what you do. Just because that's what you believe in now doesn't mean that can't change, what you believe in can definitely change because believing in it our not has no impact to if it's true or not. You can learn more of the truth and then change what you believe in and how you act. It doesn't matter if you claim to change something if you act the same way you did than nothing has changed no matter how much you say you believe in something else.