I've been exactly where you are - I met my husband when I was in college and honestly figured I'd get a degree, work for a decade, marry, and have a few kids. I always wanted to be a wife/SAHM/homeschooler/etc but I figured it would be delayed until after a career.
Then we got married, and my heart was truly changed. I longed for a baby with my husband, and when I got pregnant and then miscarried after our honeymoon (maybe related to birth control, maybe not) we were BOTH disappointed. I was shocked to find myself pregnant again on the very next cycle after that, and within a few weeks my mind was made up that I didn't want to work my whole pregnancy.
My husband was completely in agreement and was happy I wanted to be a housewife. I'd also been planning on continuing my college, but after taking a few classes post-marriage, during my pregnancy, I decided it wasn't where my heart was and the degree had nothing to do with the goals both my husband and I had decided were most important.
So we changed our plans accordingly. We got enough life insurance to pay off our house and living expenses for four to six years, so I could go back to school and get a degree while continuing to care for my children if something happened to him. I decided that I could be even MORE industrious, creative, and contribute to our household as a full time caregiver than I could outside the home. It also gave me significant amounts of freedom from some of the social/career pressures I hadn't even realized I was laboring under. Staying at home and cultivating a family turned out to be the very best decision I have made, to date, just short of marrying my wonderful husband.
Now, six years, four children, homeschooling and NO career later, I can safely say how THRILLED I am that we chose to have children immediately in our marriage and kept them coming. Even in the weeds with a bunch of small children (which is HARD, especially when I am educating them, too!) I am grateful every day for the beautiful family I have been blessed with. I've had to be very creative with our budget, as we are a family of almost-six on a single income, and we can't run our large, busy, young family the same way a further spaced, older, double income family does. It just won't work. But if I had worried at all about lacking fulfillment, value, or mental stimulation, that has been completely put to rest.
Like anything, homemaking and motherhood is so much more about attitude than money or success. Hard work, every day, with a cheerful heart and an eye on the long term gain of the daily toils... That makes SUCH a difference in how I feel. I could long for a career, resent my husband or kids, feel overwhelmed and under-accomplished, sure. But I choose joy, and my success and value isn't based on a paycheck or a degree I didn't end up getting. My hubsand's opinion of my work is far more important than what the world (and my mother

) tells me I should have done with my life. My only regret is that I didn't trust my heart and gut regarding these issues SOONER, because I could have spent the first six months of our marriage much more productive and less conflicted than I was.
So that's my encouragement, from a young wife and mom who has been where you are. It's a huge blessing to be here, in my situation, and if I want my degree and career when I am done raising children it will be right where I left it, for the taking if I apply myself in that direction. But I don't think I'd want to submit myself to a boss when I'm so busy and industrious at home and in my community, right as I am now. A degree and career has lost almost all appeal now that I've learned how to have a fulfilling, busy life without them!