@Adriana: The great thing about software development is that it's a meritocracy: nothing matters except your knowledge and skill. There's no personal politics in software development ... the computer discriminates against us all equally. 
You may want to briefly jump to the very end of this series ... in the final video, I suggest a few things you can do to build your skill. Find any web page (start with a simple one!) and try to re-create it from scratch. JUST FOR PRACTICE copy the images down from the original web page (right-click, Save Image As ...) and then write the HTML5 and CSS3 yourself, not looking at what the original author did. After you've challenged yourself for a few hours, undoubtedly you'll get stuck and then you can look at how the original developer created that given page. There may be a lot of JavaScript in the page for things like tracking or other dynamic functionality, but ignore that and only look at the HTML5 and CSS3. Websites for small businesses might be a good place to start, OR purchase a SIMPLE HTML5 template (for under $10) from here:
http://themeforest.net/category/site-templates/personal
... to see if you can re-create it, or modify it, or just understand what and why they did what they did.
But yeah, perhaps I should create a series of "challenges" for HTML5 / CSS3 developers to learn specific techniques. Good idea.
Best wishes to you! Stick with it ... baby steps and patience. No one learns this stuff in a few days. It takes weeks, months, even years to master it a little at a time.