Here goes....
I graduated with a bloody outrageous "gentleman's degree" (read: Third Class Honours). There, I said it, it has taken many years to say it so publicly, but there it is, in all its glory.
I want to start by saying to those graduating or recently graduated with the same disappointment, DO NOT DESPAIR. As others have alluded, it genuinely is not the end of the world, despite the lack of sympathy and incredibly obnoxious attitude held by many on these forums; the majority of which, have no life experience/professional career to their name or work in an elitist environment such as finance or law.
I have a very successful career, directly in the scientific field related to my study. I am ahead of the curve (or at least on par) with the rest of my cohort who did get their boring 2:1s or genuinely inspirational firsts along with most of my colleagues. None of them hold me in any less regard. Your classification really is only a filter at the start of your career and does not define your life, professional or personal, despite what others would have you believe on these forums.
What you do following graduation is incredibly important. One of the most important things to remember is that the problem is not your third class degree, but if you have a third class brain. You need to genuinely reflect on why you got a third and learn from it. If you get nowhere with graduate schemes, try elsewhere for related experience, take control of your own development. You will only be behind your fellow graduates in the field for the short-term, you will soon catch up career-wise in the mid and long-term once you have a baseline of relevant experience. Your situation is NOT permanent.
Following graduation, I applied for two reputable graduate schemes (10,000+ employees, blue chip). I received invitations for both, one HR department was more efficient than the other and gave me a job offer long before I could meet with the other company. I took it up without hesitation (obviously). The second company continued to have multiple departments try and convince me to attend interview, despite being armed with my undesirable grades.
How did I come by this situation? Fraud? Nepotism? Bribery?
NO. Although it was humiliating, I detailed my grades and transcripts honestly. I did spend a lot of time tailoring my application to showcase my other skills, experience and passion. At interview, I had the opportunity to honestly reflect on my grades, they didn't bring it up, so I did. Perhaps this honesty helped me; I did my best to explain the "cause", what remedial action I put in place and what I learned from the experience. I should also probably state that I may have been helped by attending a good University and pursuing a genuinely hard subject (NO, not all degrees are equal).
A third only holds you back as long as you let it. It will always be a gremlin in your wardrobe, I'm not saying you need to be proud of it, but you need to accept it and learn from it.
I have received unconditional offers for each MSc course I have applied for, some were happy with my paper work, others needed reassurance through interview. None-the-less, I was still accepted, although it required effort on my part. Some were related fields, others were advanced study in the same subject; the institutions were a mix of top 10, mid-league and lower-rated establishments. Ironically, it was the lower-rated Universities that insisted on interview.
A third is NOT game over, I cant emphasise this enough.
As for my career, I work on some of the most advanced Engineering projects in the world, I have been deployed abroad and I currently have significant responsibility. I have the pleasure of overseeing quite a few first-class junior employees and I have realised that they are just human too. Some are genuinely intelligent, some border-line unemployable and others who just worked their darned socks off. The inconsistency is really unbelievable and serves as demonstration as to why degree classification is not a single measurement for employability (although having a first does no harm!). Most ironic of all is that I now occasionally deliver specialist university lectures to a mix of Undergraduate and Postgraduate students. Lets hope I don't infect them with my third....!
Money! What about the money?
I am going to be coy here. They say, in my field, to be "average", you should earn a salary equivalent to £1500 for every year you've been on this earth. Lets just say my total remuneration when I was 25 was just under £98,000, which may not be a lot in some careers, but I think its a reflection of relative success.
What about my employer?
Sure, they took a massive gamble on me following University. In return, they have an incredibly hard-working and blindly loyal employee. A third class graduate has to work harder and smarter than their contemporaries. Who wins really? Is your degree class a tangible asset to the company in the long-run? NO, your work and contribution to their success is. Your embossed certificate isn't going to do them any good, nor any harm in the long run, particularly when there are professional accreditations and registrations in your field, that are far more valuable.
Keep your chin up, have confidence and be honest. You will get where you want to be if you really want it to happen.
True Story Bro.