@mollie1111,
Mollie, you are old enough, you are no longer a teenager, you are almost 20 right?
So quit with the young bit.
Ok, that's true to a degree but try this, both loving each other un-conditionally, being there for each other, trusting each other, honoring each other, feeling each other's feelings, being able to communicate, having boundries, no one owns each other because each person owns themselves, having simular morals, standards, yet having individuality and own hobbies and lives, including whom they chose as their friends, never going to bed after having an arguement being mad, rather talking it out before hand, having simular goals and passions in life, always being honest.
What in there can you see that ticks your boxes in your current relationship and what doesn't you know, pro's and cons.