This relationship would be a WAY better deal for him than for you in the long run. Walk away.
A couple things about your post concern me. He’s planning your future (a trip to Cancun, marriage, family); you aren’t saying you’re discussing marriage and a future as a couple, he’s planning your life for you. That’s not a good thing. He wants you to transfer to a college closer to where he lives. That’s also not a good thing. Transfer aid is usually pretty horrible. You need to finish your degree where you are.
It’s not a good sign that you’re afraid to tell your parents about him. When you love someone and you’re in a healthy relationship, you’re proud to let your family know about it. But you don’t love him, do you? You “like” him, but liking someone isn’t reason enough to change schools or get married; sometimes it’s not reason enough to continue dating someone.
How long have you been seeing him? You said when you go back to school you’ll see if the “long distance will make (you) quit” the relationship. If your college is 2 hours from home and you’re not a freshman, you should have already been separated by distance. If this is the first time, you can’t have been seeing him very long. If it’s been less than a year, it’s frankly way too soon to be talking about marriage. Be wary of men who are quick to push you toward marriage and a family.
If I were your mom, I’d suggest you break up with him, go back to college and date boys closer to your own age, and take time to grow up yourself before you start raising someone else’s kids. You should tell your parents what’s going on and give them a chance to help you. They can’t advise you if you don’t talk to them.
A 20 year college student is generally a person with little life experience, though of course they will adamantly deny this. I think you need to ask yourself why you aren’t dating someone with your similar life experience and instead are dating someone twice your age who already has children and paved a path in their life that is much more fixed than your life is at this point. What is the appeal of dating such an older person compared to your peers? Also, you should be somewhat forward thinking about your future career aspirations. Will you want to continue to live in the current area where your boyfriend lives or is there a chance you would need to live elsewhere to pursue career goals? Take care.