If you feel that you like working on cars and have a natural aptitude for mechanical work, than you should do fine. You can go to a community college to get a 2 year Applied Sciences Degree which will prepare you fully before applying to dealerships- or if you don’t want to go that route then you can fill an application to any dealership but you’ll probably have to start as a car porter first before you advance to a Lube Tech then you advance to an Auto Technician.
If you stick with it for years you can become a master mechanic aka journeyman and you can make a very good salary.
Good Luck in your career !!
As for it being tough, Reddit has some decent advice on it matter:
1. Jobs that are easy pay minimum wage. How easy a job is isn't really the way to go about planning your career. And no it isn't easy. It's back breaking work in poorly heated and rarely cooled shops. You're always chasing book time on repairs and you've got to be real smart to troubleshoot the modern computer controlled everything.
2. Get 2 jobs or three if you can manage it. Save up for a year or two, and then you cut down to one job. Then you either get an apprenticeship, or enroll at a community college. Apprenticeships usually end up with you learning everything you need to know, or you deciding it isn't for you. Either way you have two years of saving to either start buying the tools that will become a part of your daily life, or enough money to be able to focus on school. Trust me unless you have already done it the experience of working 60-70 hour weeks for 2 years is something that you can't replace.
3. Go to school and try to find a job as a lube tech at a dealership of a jiffy lube so you can get work experience. I've been working on cars most of my life and I finally just landed a job as a service tech and I'm 22.
4. What the others have said is dead on, but something else to consider is that you need to be very careful if you want cars to be one of your hobbies. Very few mechanics want to work their butts off to make rate all week, work on rusty turds where it feels like every fastener was put on by the hand of god, smash your hands, wreck your back, and deal with people who look at you like you get off on telling people that them not having that noise addressed when it first came up is now going to cost them 3x the value of the car to get repaired to then go home and work on your own stuff for fun.
Additionally if you don't already have a HUGE toolset you are going to be in debt for tools for YEARS. Even the low end professional tool boxes large enough for a serious tech are $2k+ and the tools to fill the box are very expensive so it is a high entry cost profession with low returns unless you run your own shop or are good enough to be able to beat rate consistently.
Hopefully that gives you some idea of what to expect going into the field. You can also visit a local mechanic or two and ask to interview them about entering the field, the pros/cons and hardships starting out.