Ignore Habib__1971, they are trolling to try to make you do doggy and make your first time painful.
It is one of the positions that offer the deepest penetration, and also provides the guy with full control. Avoid this position completely for your first few times. If you google positions for a large/painful penis every link says to avoid doggy, use a lot of lube and start with oral/fingering foreplay, which is basically what I said above.