I still don't understand why you came here when you aren't willing to read the advice given without whining about this shit. We're not entitled to our opinions? Did you really only want us to tell you to go for it? What do you do for a living? Do you even make any money? How can you support these kids? If she is pregnant, I hope you're able to make the money that's needed in order to support the family while she's not able to work.
You sound incredibly desperate. You say that you're mature enough to handle the responsibility of being a father but you consistently whine and cry when someone gives you advice. It's amazing to me that you can't even see this shit from OUR perspectives. I don't care if the 34 year old father doesn't give a shit about them. Yes, some people, no matter their age, will never be able to handle the responsibility. But the father's age still doesn't answer the problem I said you'd have eventually.. which is that being only 13 years older than the oldest child isn't going to allow you to discipline these kids or even allow them to respect you. Don't tell me they do now because all three of them are still young. Wait until they become teenagers.
The woman you're with is the most at fault in this whole thing. She should definitely know better than to do this. Her kids should be the most important thing in her life right now, and she's bringing in a 20 year old kid into her life. This was definitely too fast. How long after you two started dating did you move in together?
I'm sure you're going to take all of this as insulting again, but it's just advice. And BTW, for you to even think that you can handle four kids is absolutely ridiculous. Feel free to prove me wrong. Feel free to tell me what makes you think you can be a father right now. Don't just give me a one or two line answer. Actually post thought-filled posts in your next reply. Forget everyone else in this thread... just answer me.