Hi Millymei! Welcome to Scarleteen!
I'm sure a volunteer will come along to give you advice, but I just wanted to share my own experiences. Perhaps it will help you.
Parents are quite strange. I come from a paranoid family with a miserly father, complete with the usual Asian stereotypes. So of course, studies must come first, in their opinion. My parents met my boyfriend in 2012 (when I did too, it's an LDR), and my mum told me in private exactly what your mum told you. Nothing can happen until I graduate (And I was already in college/uni!). Last year, he came back to visit me on my birthday and I broke the news to them (Pretty much just blurted out "We're dating."). At first, I thought it was gonna be bad, because the situation turned awkward... My parents are now joking about having "blonde grandkids"...
No, I have not yet graduated, I still have 1 more year to go. They've also told me to stay away from bf's hotel room when he visits because according to them, the "Western culture" is to have sex all the time and I'm to stay virgin until my wedding night.

Obviously, I'm not listening to them, and I'm pretty sure they suspect that I'm not, just like they suspected our relationship since the beginning. It's all to do with that parental instinct and intuition.
My point is, it's your life. It's your decision. But because you have never been in a relationship, I would highly recommend letting your mother in on any that you happen on. Mothers are really awesome about such things and that support is invaluable. I'm SO happy and relieved that my parents know 100% about my boyfriend. Perhaps you don't HAVE to talk to your mother BEFORE finding a relationship, just... introduce her to the guy, let her get to know him and then later tell her that you really like him a lot (it's what I did!). Only three things can happen from that:
- She likes the guy and tries to support you in your decision (most likely)
- She doesn't like the guy, have bad feelings about him and tells you to break it off before you get hurt (quite likely, and you'd do well to at least see it from her point of view. Dat over powered intuition!)
- She ignores your choices to live your own life and tells you to end it (judging by how much you say she respects you, this is highly unlikely)
In the end, it's really all up to you. By all means, let her in on your decisions, but don't let her control your life.