How can i become an actress?

Hey, alright, so I have been interested in acting for a long time. I've been a part of two productions already that have been involved with school and I love it, I also took Drama as a course. Now I'm 18 though and I'm just graduating so I really want to get out there now. I'm from Europe, but I'm moving to London after summer and so I want to start going to auditions or something. However, I only enjoy movies and stuff that's on tv, it seems more naturalistic for me.. as in theatre it seems too melodramatic and I wouldn't enjoy it as much. It's been a huge dream of mine for a long time and I really want to become successful and use my talent in a good way because I've always been pionate about it and I've been artistic in a way, so I'm not in it to be famous, but just to be recognized. I'm also thinking of moving to LA after as well, but I don't know how I'd tackle it all as I'm not rich or anything and that my parents would pay for me til I'm like 22. I don't know how I'd handle it all...Also, I'm not a person who thinks of 'failing' as failing, but just as a lesson and to keep going, if you know what I mean. And I am really serious about this as well.. do you have any tips or what I could do? Because now that I'm an adult, everything is so overwhelming for me.