Remember that it takes practice to learn, but eventually you will feel the car is an extension of you. Don't think of it as being pressured. Think of it as potential freedom. Learning to drive helped me feel so much more independent. I got my license at 18, later than most kids I knew, who got theirs at 16. But I think lots of young people are starting later now, because of insurance costs, so 19 isn't so old. I just gave myself more time to practice, stretching my skills a bit at a time.
If you have a large college campus near you, their less busy parking lots are great for practicing on weekends. I did that a LOT before practicing more on the road.
Also remember that once you have a license, you're still learning for the first few years. It's important not to get cocky about it, and not to feel pressured into drives that you know you're not ready for. Just pace yourself according to your ability, gradually building your skills with longer or more difficult drives into new territory.
Keep talkative or otherwise distracting passengers out of your car. I still don't like to drive with talkative passengers. Too distracting. For that reason, when we go somewhere together my gabby husband drives.
When I was young, my parents used to buy my gasoline in exchange for driving my grandmother wherever she wanted to go, after she gave up her license. She was really good about not backseat driving, only saying something if I was obviously goofing, or there was some hazard she didn't think I was aware of. If someone starts to help you who is too talkative or nit-picking, ask them to keep instruction to a minimum so as not to fluster or distract you, and if they can't shut up find someone else who isn't so talkative. That helped me a lot. (I couldn't drive with my dad. He coached too much.)