3 years of C with a couple of hours each day is probably about the equivalent of C++ for a year straight at 10 hours each day. You should be "okay". Glad to hear you don't intend to drop it completely.I've spent about 3 years on C but no full time study (no more ten hour sleeps!). C++ I just started late last year and i will still keep learning it. I'm not looking to move from C/C++, I'm just trying to learn more as it will most likely help me get somewhere. I will learn SQL with php as suggested.
How long have you been learning C and C++? If you've been learning under a year (especially if it's been under 10hr/day for any significant portion of that time), and can forsee yourself taking a job requiring you to know C and C++, then you haven't learned them nearly enough yet. Give it another few years.
If you want to continue learning C and C++ PLUS expand into web development, you can always learn how to program CGI applications. Plenty of CGI libraries exist that can help you with the painful part of actually implementing CGI; and all you do to output to the webpage is std::cout or printf()/puts(). I did this once and found it to be a very rewarding experience, but not nearly as productive as simply using PHP or another C-like programming language for the purposes. It's not the best way to do web development; but it'll familiarize you with the basic concepts while allowing you to continue learning the difficult and complex C and C++ languages.
If you seriously want to drop C and C++, let yourself rust even though you're probably not amazing yet anyway, then I seriously recommend that you "shop around" for a few months. I've never used Ruby on Rails personally; but I have only heard good things. PHP is very C++-like and might bring a level of comfort in use, and has many more pieces of already-available software and supplemental libraries than Ruby on Rails. I also recommend you learn a little ASP.NET and JSP as I know that some businesses do run their website on those as well.
SQL is a must know. In particularly, MySQL and PostgreSQL are very common in the industry, open source, and available on numerable platforms; I recommend you familiarize yourself with the similarities and peculiarities of those two. I've never worked for a big company in this field, and it is possible they commonly use some other DBMS; but at least the basic principles will still apply.
I'd still like to hear from people that have used GLES and WebGL. I'v read WebGL works with html 5, but does GLES work with C/C++ or just Objective-C?
As for GLES, it is a C API; so naturally it can be used with C. For iPhone development, you absolutely need to use Objective-C unless you want to drop money on an SDL commercial license.
On Android you can use it in C/C++ using the NDK or Java using the Android SDK.