Hi,
I'm currently near the end of my A2 year, after dropping out in my original A2 year and, like you, not achieving what I knew I was capable of. I currently need ABB and I had AS grades of CDD at first (I resat a few exams when I left).
First of, you should not feel disappointed. You got BBD. They're decent grades! Yeah, not Russel group grades, but considering how you struggled and the AS grades you had, well done, really. It's not like you did easy subjects.
There are a range of opportunities to still go to university, if you want to. And before you say 'But I'll be so old!', assuming you're 20/21 right now, you really won't be. I have a friend who had to retake AS twice due to health and I honestly did not realise she was 2 years older than all of us until it was her birthday. Plus, I'll be 20 myself when I go to university in September.
One thing you could do is a foundation degree. I don't know what type of degree you'd be planning to do (as you did a decent mixture of sciences and humanities), but I know that universities do offer them. In my college in Merseyside, we offer a foundation degree level for students who attend the university of Liverpool after 'year 0'. Their qualifications vary. For many degrees Liverpool uni asks for around ABB and I know people from my original classes who do the foundation year (who achieved the likes of BBC). There are also people who left education after A-Levels and worked and gained experience for a few years. My own Computing teacher did this. She achieved C's and D's at A-Level, worked as a programmer for a few years and then did a foundation degree and went to university at 27.
https://www.liverpool.ac.uk/study/undergraduate/applying/before/foundation/https://www.dur.ac.uk/courses/?q=foundation+year&s=Search&level=Undergraduatehttp://www2.mmu.ac.uk/study/undergraduate/courses/foundation-year/courses/(that's just a few I found by typing 'universities with foundation years' into Google)
If you're in a position to do so, you could apply straight to university by working in a related job field and then reapplying. You should take a look at a few university pages and check out the 'mature students' section, or, if you find a degree you like, you could contact the university/department directly and discuss your experience/current qualifications. I know the likes of the university of York has this section on the entry requirements page for some of their degrees.
An example of a mature students requirements section (from York BSc in Computer Science, what I've applied to):
'We welcome applications from mature candidates and will assess any application on its own merits. However, we still expect you to have an appropriate background in Mathematics. We recommend that you contact us for an informal discussion before you apply.'
You could also apply to a university you already have the grades for (maybe one that asks for UCAS points). From the sounds of things, you were probably aiming for a more highly regarded university, but, depending on the subject, some lower grade universities can offer good degrees. Maybe take a look at some league tables and see what lower grade universities rank highly/moderately?
If you regret not going to university and you still want to, please don't feel guilty and disappointed. There are so many people who don't get to university the traditional way (myself included) and I feel like those stories never get shared. And if you go and end up dropping out because you don't like it, then you know it's not meant to be, but at least you can have piece of mind that you tried. Keep your chin up.
https://www.ucas.com/ucas/undergraduate/getting-started/mature-studentshttps://www.gov.uk/mature-student-university-funding