Need some female advice...?

My girlfriend of almost 4 years insists that we have unprotected sex each and every time. I am 25 years old and am so not ready to start a family yet. How can i get her to understand that this bothers me because we can't continue to play a dangerous game.Were completely monogomous, deeply in love, and live together. She wan'ts to get married as soon as possible and i know that starting a family will be shortly after but im not ready and it would be unfair to bring a child into this world when it wouldn't be able to have the best of everything.Do i tell her no more sex until it's with a condom? Any advice ladiesShe has said to me that she doesen't want to have kid's just yet but she isn't on any kind of birth control. We didn't have any sex between her last period's and i wen't through the 28 day's like it was nothing. i didn't notice until after but how long could that continue until one of us (probably me) will go crazy.she says she doesen't like to make love to"plastic"

no dont tell her that... try to be sweet and mature and take control.. like tell her...that if you would want a kid and it will be defenitely with her but you wanted to get married first and get a good job and save money for kids... tell her you wanted a lot of kids from her... and be sweet.. and tell her..."baby if we have a kid i wanted you to stay with the kids and not work"oh thats lovely...! so thats why you have to plan it good and be safe for now.... and try telling her too in a sweet way..."i dont want you to be fat/chubby on your wedding gown"lol.. and surely if baby comes first we do women gained alot of weight l.o.l.......so its all about talking it over with her.. but be sensitive with her you dont want to hurt her feelings.reagarding marriage, if you are not ready. tell her straight what holding you off.. trust me.. there no better than honesty