Well a blog is really an online diary.
People tend to use it to document some event or other in their lives (maybe planning a wedding or other major event) or if they are say a photographer then telling people about recent pictures they have taken, things like that.
So it depends what you have got happening in your life that is worth telling people about.
If you are planning a round the world trip, or planning to climb mount everest, it could be very interesting.
If it consists of "woke up, went shopping, went to the pub, got drunk" and little else then one would say it is NOT very interesting (I am not saying you are like that, it is just an example).
So if you have a lot to say, go for it.