As others have said, getting a 2:2 isn't going to have any serious long-term effects on your future, unless your intention is to stay in academia to jump straight into a Masters degree, in which case it'll limit your choice of courses.
As far as employment prosects are concerned In the short-term, it will most likely mean that your starting salary in a graduate job will be lower, and you'll need to keep an open mind about the kinds of jobs/organisations you apply to work at.
A 2:2 might mean that some of the top graduate schemes in large organisations end up being out-of-reach, but as long as you stay flexible, you'll still be able to find plenty of opportunities at smaller and medium-sized organisations. (Later on in your career once you have a few years of solid experience, those big organisations won't care about your degree anyway, and you might have an easier time applying for a good Masters degree later on too)
When you're applying to and interviewing for those jobs, your degree classification will only be one factor in somebody's decision to hire you; employers will also want to know what kind of person you are and what your attitude is to work and learning; your interpersonal skills and written/verbal communication skills will be important, and so will your enthusiasm for the kinds of jobs you'll be applying for, and whether you have potential to grow and progress, as well as whether you'd be a good fit for the culture of the organisation you'd be working in. None of these things really have anything to do with your degree classification, but being the "right" kind of person can very often put you ahead of other candidates - including candidates who might have graduated with a better degree than yours.