..i have some confidence problem

The key to being able to remember things is repetition. Don't sell yourself so short because even the best developers can't remember everything. In fact I will always reinforce the idea that a great developer is one who understands how to read documentation.

There are hundreds of css attributes with multiple values and multiple browser implementations/bugs/quirks. It would be unrealistic to expect anyone to remember them all. Part of what you are experiencing is called imposter syndrome, and it is very rampant within the computer tech field. It is the feeling that you aren't worthy of your accomplishments or praise for you work. David Walsh wrote about it, as have many other people within our field: http://davidwalsh.name/impostor-syndrome.

Try not to look forward at what you haven't learned and instead look back and realize how much you have already accomplished. Looking at your profile, it looks like you've already done quite a bit in regards to getting started in web programming and design. There are plenty of people who don't even get that far.

It can really be difficult especially without a close friend or colleague whom you can be mentored by and learn from, because the only measure of your success is what you can see and when you compare it to what other people are doing online it can seem insignificant. Never feel inadequate because you are still learning, all of us are, the only difference is the amount of time we have been learning.

Every day I am at work, I spend a lot of time catching up on the newest web development practices, there are so many languages coming out, every day there is an article about the next Hot Javascript Framework and it is surely enough to make anyones head spin. What I have learned to do is spend some of my free time using Treehouse to learn about those things but spend the most of my days worrying only about the problems I need to solve at the moment and reflecting on how far I have come and realizing that I have solved so many complex and unique problems.

Some things that can help you progress include:

1. Follow Some Blogs- http://alistapart.com/ . http://www.smashingmagazine.com/ . http://speckyboy.com/ . http://www.onextrapixel.com/ . https://css-tricks.com/ .

2. Interact with people on Github, there are a lot of projects you can contribute too. Recently I got onboard for testing out the new Foundation 6 and as a result learned a lot about accessibility and how these things are built.

3. Go to a programming meetup. There are plenty of great maker/hacker spaces, WordCamps, and of course numerous tech conferences. These are a great way to learn new things and meet people.

4. Freelance some work. If there are any non-profits nearby such as animal shelters or homeless shelters, many of them need facelifts on their websites (if they even have one). Many of these places don't have much money so it is a great way to have a project to work on, at your own pace, where you can learn new skills and gain experience communicating with a client. Eventually you can even move on to charging clients and making some money too.

You are already doing a great job working on your way to becoming a professional. Just remember to value yourself as a developer/designer and to not discount yourself and your skills. Keep on keeping on with learning new things and you'll get there!