If I had a penny for every time I heard, "Oh god, how do you cope without a man?!" or "Oh god, I couldn't cope without my partner/husband!"
Bottom line? You can cope. You do cope. You just get on with it.
I have always been a single parent to my 7.5yo daughter and my eyes want to roll into the back of my head whenever somebody talks to me about how "hard" I must find parenting. The fact of the matter is: I don't know any better. I know what I know and I just crack on with it.
Children will exhaust you no matter what your relationship status is. Sleep deprivation will feel just as crappy no matter how many hands are on board. Worrying about childcare when your little one is ill is standard for every working parent. Struggling to keep on top of the house whilst working and raising a child is a gripe every parent faces. You will occasionally daydream about locking your little darling in the shed so that you can drown out their noise and have 2 minutes peace - just like everyone else!
My advice? If you want a child, have a child. Get yourself enrolled onto your nearest NCT group so that you can make some local friends - they will become your support network. Start looking into maternity pay/leave at your work so that you know how long/how much you'll have. Look into childcare options ASAP and do the math - can you afford on your wages or would it be possible to claim any tax credits to help you. Also see if your work do a childcare voucher scheme.
Relationship status is meaningless when it comes to being a good/bad parent. Being married/single doesn't give you a free pass into perfect parenthood. It just makes you married/single.
My sister had her DS at the end of 2013. Her idea of coping is taking my nephew to the park by herself for a couple of hours - without her DP there to help.
My idea of coping is juggling a 30 hour working week with no childcare in place when my dd gets sick and can't go to school. It means catching maybe an hour of broken sleep at night. It means juggling work commitments and swapping shifts around last minute, thoroughly pissing off my colleagues. It means putting on a different wash every other hour in between scraping vomit out of whatever mattress/carpet/sofa got hit last. It means comforting her and trying to keep her upbeat when she gets upset at how rubbish she feels as I frantically run around disinfecting everything she touches. It means quickly getting on with all the other housework whilst she catches a few Z's, as I throw the dogs ball up and down the hallway for her until she exhausts herself because I haven't been able to walk her with a sick child on my hands. It means putting in a few desperate phone calls to friends to see if they could pop to the shop and bring me X, Y and Z due to my being housebound. It means suffering through another rerun of Mary Poppins because that's the only thing she wants to watch and it's keeping her happy. It means rescheduling appointments/classes we can no longer make. It means putting an extra spoonful of coffee in my cup to keep me awake. The list goes on and on. But more importantly it means I get on with things knowing that nobody's coming through the door to give me a break.
Different stokes
I'm no more exhausted than my sister at the end of any given day because we each have our own 'norm'. She wouldn't cope well initially with my life - she'd end up having palpitations. But I wouldn't cope with hers initially either - I'm not used to sharing my home, my child or my life with anyone but myself 
Parenting is hard because being a parent is hard. It will make you laugh, make you cry, send you to your room to scream silently into a pillow, it will frustrate you in ways you never thought possible, it'll be the most mundane and the most incredible thing you've ever done (all at the same time - confusing as hell!), it will stress you out so much you think insanity is just around the corner and it will make you realise just how big your capacity to love truly is. It isn't for everyone, but if you think it is for you - do it. Don't get hung up on titles. Single, married, divorced, gay, Smurf - they just don't matter.
Do what's right for you, OP. Best of luck 