I passed my test when I was 18. I was a good driver, but nerves got the better of me and I failed it many times. (always 1 major fault and no minors)
I had a car for a couple of years, then sold it when I went to live abroad. I came back to the UK and haven't had a car since. I live in London so there is no need for a car because public transport is so good. I'm a train journey away from the beach. Its cheaper, better for the environment & better for my health.
I think it depends on the area you live. Is everything you NEED within walking distance? ie. work, schools, supermarket etc. Is there a well-connected train station? What's public transport like? If you are out in the sticks, then you need a car, but otherwise, it is perfectly manageable. :)
Btw, I live in London now, but I have lived all over the country. The only place I felt like I really needed a car was in Ham, Marlborough. (I hated it and didn't stay there for very long!)
Also, if you don't have a car, insurance, fuel etc to pay for. You should be able to get a train ticket to the beach, or even a plane! From London, you can get a flight to France for £20. (Where I am that's a 30-minute bus journey to the airport + a £20 flight). Bear in mind it's like £80 to fill up a Ford Focus!
That said, passing your test will make you feel accomplished, even if you don't end up getting a car, there is always the option. I would persevere. It will be worth it! Wishing you all the best OP!