I'm a male singer. I've been studying voice, training, and doing exercises for almost 15 years and my natural chest voice range is still about the same, a D3 to about an F4. It's always been this way. I've been able to sing more easily and comfortably in head voice. I get above F4 in chest then I have to push really hard, which I'm always told sounds strained. Because of this the training I've done I've learned to start mixing at around E4 to F4, but it's so light that it basically might as well be head voice once I get up to G4, and there's no real power behind it.
It's really frustrating because I don't have the ability to sing lower notes, nor do I have the resonance of a baritone, but I can't hit high notes comfortable the way natural tenors do. This to me just doesn't seem normal or natural and I am wondering if I have something wrong with my voice.