No, you didn't push him into anything, but you didn't say no, either.
You asked why his parents do not like you. Only his parents and maybe he knows the answer to that question. Have you respectfully asked them?
The people who have responded have tried to give you some reasons from their experience and perspective. You don't seem to like the reasons that have been given.
I am not certain if it is the arrogance of youth or defensiveness due to having your perception of your life turned upside down, but you do come across as self-centered and caring only about your own wants and desires. If you are pregnant there is another life that will depend on you making the best choices you can and not excusing your behavior with, "everyone else is doing it" or "he is worse." There are no do-overs or second chances in having a healthy pregnancy or raising a child. In 18 years you will be in your parents' shoes. It will be your child dating and wanting to have sex if they aren't already sexually active by 13/14 years old. Will you have the same attitude then that you do now about teens being sexually active?
You say that you will 18 in a few days. I sincerely hope a positive pregnancy test is not one of your birthday gifts. While many young parents do mange to make a healthy and happy home, more do not. You can make all the plans you want and Life will do its best to mess them up. The choices you make can make it easier or harder. Why make it easier for Life to mess up your plans?
You seem to think it will be easy to go back to school after having a baby. What you don't see are the stresses pregnancy and a newborn put on you and the relationship. His wages may seem good now, but they may not be enough for childcare, tuition and all the other assorted costs that come from having two parents 'working' outside the home. His jobs and schooling may not allow for him to be home as much as both of you may want him to be or to be able to take care of the baby while you go to school or work. Grandparents and friends can and are willing to do only so much. You cannot expect them to change their lives because of your choices.
You have been with your boyfriend for seven months. You say that it is more serious than his past relationships. How do you know? How long have your past relationships lasted? How long have his? You have said he was sexually active in the past so you know sex isn't making it more serious. Strangely, discussing the future doesn't make a relationship more serious. Too many couples make plans that never happen or Life throws them a curve ball and everything falls apart.
One of the things you say you think might be a cause of their 'dislike' is that you aren't 'wife' material. Have you ever done anything to show them you are more than a bed buddy for their son? Have you tried to improve your cooking? Have you offered to help when you are at their house? Shown an interest in the day to day activities that give your boyfriend his main source of support? How do you treat his parents?
You have a lot to think about. Be honest with yourself.

