If you don't fall in love by 20, don't freak out.
This isn't to say that being in love isn't totally cool, because it is. If you've found your person, celebrate the heck out of it. All this is saying is if you don't fall in a "forever" love at 20, don't panic.
You are very much not alone.
This isn't the same world that our parents and our grandparents lived in. You don't have to have had 40 kids by the time you've exited your teen years. This is our world, and it's a very different world. Our families love to tell us that often, so they should definitely understand that this isn't necessarily the right time for you to be all wifed or hubbied up in this crazy, new world.
It's time to be fun and single, and make the next decade one of the best times of your life.
This is the time for you entirely. This doesn't have to be about you completing yourself with another person. This doesn't have to be about popping out kids and raising them.
This does have to be about you being the best version of yourself.
Take the time to self-love in any way and in all ways and in the best ways for you. Take the money you do have and go travel. Go see your friend who lives halfway across the world. Take the time to complete your degree. Or go get multiple degrees. Take the time to invest in your friends. Go out to bars and dance all night. Take the time to call your family often.
There's so much more to life than trying to force a relationship at 20. You can't spend all your time overanalyzing every move a potential boyfriend/girlfriend is making towards you. Love will come when it comes. Focus on falling in love with yourself, your goals and your achievements right now.
You will never find a time in the rest of your life where you're as free as you are right now. So if you don't fall in love by 20, don't be alarmed.
Don't fret.
Don't lose sleep.
You're doing exactly what you're supposed to do and everything else will fall into place.