x-X_Deus Ex_X-x
If you're questioning, definitely not. It's going to wake you up screaming at four in the morning without fail every night. It's going to cry for hours straight for absolutely no reason. It's going to s**t itself twelve times a day and you're going to have to clean it. It's going to demand every second of every day, it's going to demand every cent you earn, it's going to demand that you give up your social life, career, and sanity. Your body will never be the same, either. It's an impossible job with no reward. Some people get joy from being so selfless, but very few can and very few are prepared for just the staggering amount of insanity a child is. If you have to ask yourself questions about it, and especially if you have to ask strangers, no.
That's not always true. I don't have a baby of my own yet but I was living with my husband in his mother's house when she was pregnant with her youngest and I was there from day one. Since his mother started work pretty much immediately after giving birth I had the baby day in and day out. We even had all of her stuff in our room.
My little sister slept soundly every single night and I often got full night's rest (I am a light sleeper and even her whines would wake me up but even when she did whine she usually didn't wake up). She used to wake up and start to whine a little and squirm at around eight in the morning most mornings and would instantly calm down when I picked her up and put her in the bed with me.
I would change her diaper maybe a handful of times a day and as she got older I had to do it less and less. She didn't poop as often as you make it seem and even when she did it really wasn't that bad.
It won't demand every second of every second of every day. That is why you have baby sitters, day cares, and as they get older there is school. With OP having two step daughters that are 18 I am sure she will have no issues getting people to watch her kid. Therefore you can still have a social life, a career that you want, still go to school, and keep your sanity. If having a kid was so awful people wouldn't try to do it.
No a kid won't demand every cent you earn. When they're little and going through clothes like crazy you can get clothes, strollers, and toys very cheap through thrift stores and yard sales. Diapers are expensive but so is everything in life. A cheaper alternative is cloth diapers if it is really an issue. If you're talking about when they're older you can tell a kid no. You don't have to buy them everything. Can it be expensive? Yes. But it is worth it.
Your body decreases with age anyways. Your boobs will sag with age, everything starts to sag and skin begins to get all loose. A lot of woman get down to pre baby weight or look better than they ever had in years with exercise and diet.
It is a demanding job but is very very rewarding. You look down at that baby and realize that it is you. It is part of you. Having someone to depend on, someone to share things with, a tiny you. Every event in life, hearing them say they love you, having someone make you feel needed. It is an amazing feeling. My little sister isn't my child but now she is four and whenever she runs up to be and says "I love you Mandy" and kisses me, my heart melts. Her little giggle, watching her play, just the amazement of watching a tiny person develop into the person they become. It's amazing and nothing in the world is like it.
I'm not going to lie: some children are straight up crazy and rotten. Usually the parents are to blame for s**t upbringing. It's not a cakewalk and some kids aren't as good as my little sister was because of temperament. But having a kid isn't this nightmare you make it out to seem to be.
TO THE OP:
There is nothing like having a kid. It is an amazing journey and you change so much during it. Seeing a mother hold her child for the first time you can see the pure love and connection and emotion. It really is up to you and your boyfriend. It's based on what you want, what he wants, and where you guys see yourselves in the future.
If your relationship isn't serious right now I will tell you that having a baby will not make it so. Don't have one when you're not confident with it because if the stress makes it worse or if it's bad now it will not make it better or keep him around. If he leaves you it will be a big mess once you have kid, a bigger one than if you didn't.
Do you feel you can handle a pregnancy? It isn't for everyone. If you are happy with your step daughters and your dog and feel that is enough, than maybe now isn't a good time and that's okay.
You never know how you'll feel in the future. You may have more money , time , and patience in the future and you may have a strong desire. My mother in law had a baby at 40. My mom had me at 40. A lot of people don't get married until early to mid thirties so don't feel like you don't have time. You have plenty of time.
Sit down with your husband and talk about what he wants. He has been through raising children and can tell you what it is like. You can figure out if it fits in your budget and life right now. Don't let anyone (especially on the internet) make big life choices for you.