I also reside at a location, where the government blocks a number of websites related to security, and although the majority of their effort is around blocking pornographic content, I am sometimes bothered by the categorization of the content filter, or their choice of blocked sites. But it's not the blocking that bothers most, it's the fact that their Internet use is generally monitored and recorded in this country.
If your question is "can governments decrypt my VPN traffic", the answer is "depends". There is a concentrated effort by the Five Eyes intelligence agencies, and the effort (and partially its results) has been brought to us thanks to Ed Snowden (check out the Turmoil/APEX projects high-level info here (Der Spiegel magazine dumps), mainly focused on IPSEC). OpenVPN's TLS use also depends heavily on the implementation at hand, although 2048-bit RSA still is considered "out of reach" for the big guys.
Having said that, the other things that a government can do:
The government agency that monitors Internet communications knows you are using a VPN. They may interpret this as "this person has something to hide". So you've probably ticked the first box in the "surveillance target" selection scheme.
Using various techniques and patterns they would be able to ascertain and identify you from other VPN users across a variety of locations - a coffee shop, a friend's house, etc.
Using these patterns they will try and track your non-VPN activity to build a profile and to start using other methods to monitor your posts, etc.
They may try to run VPN disruptive techniques to bump you off the VPN, so your browser and/or other programs leak unencrypted packets in the immediate aftermath of the VPN going down. That will give them an idea what are you up to, e.g. hosts you're sending packets to, or even limited content.
There have been attacks on VPN traffic that may help them discover certain patterns (e.g. when do you come back home from work).
In general many commercial VPN providers do not provide you with measures that will ensure maximum protection - they're not going to give you the strongest encryption, because that's more overhead for their servers. Also, because of their commercial activities, they do attract a lot of undesired attention.
My general recommendation is to run your own server - rent a cloud server for something like $19 a month within a country that generally won't be as keen on eavesdropping on your funny cat pics surfing habits over social media. In addition to that, run a legitimate mail server on it, and a WordPress site, and if anyone asks - you're just securing your connectivity to your mail/business server. You'll be using the VPN for legitimate business reason. Not that it will be a deterrent, but may win you the benefit of the doubt.
