Well - casting yourself (even for people who are skilled, have connections and agents and publicists and big money and armloads of awards) is extremely
presumptuous. You are only setting yourself up for failure that way. Angelina Jolie and Meryl Streep are not guaranteed parts, and neither are you.
Also recognize that the vast, vast, vast majority of people who act are not big stars, and rarely have major roles. Take the actor Steven Culp
. This man is a decent actor although most Americans would probably have an idea of who he is but might not recall his name. They might just think - I know that guy from somewhere
. He has also been working, rather steadily, since 1982. Note that there's a 5 year break at the beginning of his career in the IMDB listings, but that's not due to him not working. It's due to him doing stage acting and perfecting his craft. He is not a big star. Yet he obviously makes a living at this, and has been for going on thirty years.
Even more actors and actresses are like my friend Robin Alster
(we went to High School together). She acts on the side, but has a day job. She knows the chances of her making enough money to live on by her acting alone - those chances are rather slender. But she has fun with it.
You need training. And you need experience. And you need connections. So you need to (a) go to school and (b) start getting into as many local productions as you can. Work hard. Show that you are a team player. And get yourself out there. Oh, and (c) start making friends in the industry. This goes along with being a team player. Is there a professional production coming to your area? Do your best to see if you can meet people, and talk to them. And I don't just mean the stars. I mean the background players, the stage hands, the understudies. Everybody starts somewhere and those people may very well be on their way up.
A few other things - learn to sing. Versatility is extremely helpful. You also need to learn how to be persistent, and how to take rejection. Actors are rejected a lot
of the time. But the ones who hang in there eventually get something. Small stuff like Robin gets. Medium-sized stuff like Steven gets. And big stuff like Angelina gets.
Best of luck to you.