I'm 18 years old, I learned HTML5, CSS3, Js, JQuery, Bootstrap, SASS and I built 4 web pages using these skills, can I become a successful front end web developer?
Absolutely you can - that is THE foundation for a successful career. Make sure your code is clean and valid and that each of your builds follow a consistent pattern (so anyone with your skills could come in and understand what was going on under the hood). I would also HIGHLY recommend adding Wordpress to your skillset.
