Okay, I have obviously namechanged for this. I will add the disclaimer that I don't think you should be an escort OP. You sound as if you hate the idea 
and no one who hates the idea should do it.
Strangely though it sound like you with no family support. Once, just before Christmas, I went to get some cash out of the bank and my card was swallowed. I had NOTHING - and no friends to ask (was v v v isolated at the time.) I was working, but transport costs and mortgage/bills meant everything came out as soon as it went in. I was often hungry.
I completely panicked and I ended up on the streets in a red light district. I slept with two men that night and gave one a blow job for £10. I 'earned' £90 overall but I did hate that because it was frightening and dark and depressing. But it did give me the idea I could have sex for money.
Firstly, with an agency, it is safe. Sorry, but it is. Most agencies give you a 'driver' who drops you off and he waits outside. Mine was built like a brick shit house. Plus they have the mans number and address. If it's somewhere else like a hotel then that is different but you're out within the hour and my agency would send the driver in if they hadn't heard from me within 5 mins of getting in and if I wasn't out 10 mins after the hour was up.
Some people find the idea of selling their body abhorrent but I never did. My life became so much better when I started working for the agency.
I only once had an unpleasant experience and that was with a crowd of drunk boys who ordered 2 escorts and then slept with me and another girl and were horrible to us. Even that though wasn't anything too bad, we just told the agency and that address was blacklisted. The men I met were overwhelmingly so kind, polite and respectful.
You don't have to do anything you don't want to do, it sounds grim but agencies have a list of who will do what. 'A' levels (a different term for the exams!) are rare and girls who offer it can charge extra but I never did. I also wouldn't do 3somes with two men but I would with a man and a woman. Stuff out of the ordinary doesn't get asked for much to be honest, occasionally you get a request for a certain colour underwear or can she wear high heels but that's pretty much it. In my experience it's pretty mainstream.
What is knackering are the hours. I would start at 8 on an evening and you'd get usually one at 9 and then interspersed throughout the evening, trying to be sexy and alluring at 4 in the morning when you just want to sleep and you've already had sex with 3 men is hard! I worked in London but the agency sent me all over the Home Counties as well as inner London. I used to sleep a bit in the car.
I got £50 per man, quite a lot of the time they didn't actually want full penetrative sex but seemed to prefer oral. So I would usually earn between £150-£300 per night. Week nights were obviously quieter and that was nicer in a way as I got a bit more sleep!
That was how I found it but my experience won't cover everybody's. I don't honestly regret it and I don't think I am dirty either! I always used condoms and have never even had a pregnancy scare but it's a good idea to keep having regular sexual health checks.