Man, just ignore that teacher. Anyone who's spent even a few minutes reading the suttas will tell you that arahants were swarming like flies in the pali canon. What's the point of spending all this time meditating if it's impossible to find release at the end? Make it a habit to ignore people who say something is impossible, and you'll be much happier in life.
Maybe a good question to ask yourself is, is thinking about attainments helping your practice, or is it just spinning your mind in loops? You are going to find a great deal of people will challenge/deny anything you achieve. If you focus on what to call yourself, or even what tradition to place yourself in, you're going to waste a lot of time defending yourself, or looking to teachers to confirm what's happening in your own head. It's your mind and your personal experience, so you're the only one who will ever be able to confirm your own attainments.
You asked if you're delusional, I'd say why does it matter? Do you feel less stress? That's not delusional. If you're attached to the system, then you can be delusional. If you are your own sail and rudder, you can never be delusional. Be your own refuge and find your own way!
All that said, if you describe in detail the physical/emotional/sensory experience of whatever meditation effect you want to put a name to, I'm sure someone can help ease your doubts a bit. Whatever they say, though, keep going with what works for you! Make this a lifestyle rather than a series of sprints to attainments and you'll see greater benefits that come with less doubt and uncertainty.