Try to remain calm, that's not as long as many people waited and still waiting.
Here's what UKBA state:-
Service standards
We have service standards for processing UK visa applications. Our standards say that we will process:
90 per cent of non-settlement applications within 3 weeks, 98 per cent within 6 weeks and 100 per cent within 12 weeks of the application date;
and 95 per cent of settlement applications within 12 weeks of the application date and 100 per cent within 24 weeks of the application date.
Please note that we define 1 week as 5 working days.
Click here for the guide to processing times
