Almost 20 and I want to TTC

So I'm going to be 20 in October and my boyfriend is 21. We're in a very committed relationship and I don't know if this sounds rational but I really want to start a family with him but I want to start now. I'm so in love with him and I know I'm gonna spend the rest of my life with him. I just look at him and I know it. Like I know that I want to spend the rest of my life right by his side. So my question is should I go for it and TTC? I'm a junior in college and I really want to talk to my mom about it but I'm scared she'll maybe judge me or something.