I turned 18 last July and I do not currently have a drivers license, nor a state ID (meaning I have no actual photo ID) .
However, I do have a passport.
Can I use this when people ask for ID, given that I'm in America as an American, for example, when I'm at the bank?
Yes. A domestic passport is sufficient photo ID for any purpose (other than driving or establishing state residency) and is expressly authorized as sufficient ID for employment on a form I-9 and for banking "know your customer" rules.
Indeed, for some purposes, even an expired passport is sufficient ID as it establishes citizenship.
It depends on what you are using it for. AFAIK, there is no law specifying that a passport must be valid for every single potential requirement of photo ID.
For example, until 2010, you could not use a passport for purchasing alcohol in California, because it does not have a physical description.
I use my passport all the time for ID when flying commercially. I find it kind of bulky/clumsy to use other day to day activities. Drivers License suffices for those activities. OP should get one. All adults should know the rules of the road and how to drive. In many states, one is considered an inexperienced driver and faces higher insurance costs until they have 6 years of driving experience, and cannot rent a car until 25. Get your license early and start accruing the experience.
