<human>: Provide a brief overview of the text.

I'm young, a Senior in high school, and I've been in my first relationship for almost 4 months. Everything is fantastic so far, but I won't go on about it because I would just end up rambling about how great my girlfriend is.

I only have one concern with the relationship, and that is the fact that I know most first relationships inevitably don't work out in the long run. I realize that this is all because, as youngsters, we are both still growing and aren't entirely sure what we want in a partner. Even with my first relationship, I'm taking it very seriously and making a true effort to build something that will last, because my immature-teenage-boy feelings are very strong and I feel like that is what my girlfriend deserves from me.

I consider myself a rational person and so I avoid subscribing to the silly teenage illusion that this relationship is without-a-doubt going to last very far into my adult life. I realize that it could, and at this point I hope that it does, but I'm not so headstrong as to be 100% sure that it will. 

I accept the fact that our relationship may not last, but that causes me concerns because I really hope it does. I realize that this shouldn't be a huge concern for me and that I'm overthinking and that I should just take things as they come, and I wish I could just enjoy myself and my relationship in the present while not worrying about whether something is going to inevitably go wrong, but it's a constant thought that sits in my brain. I can't relax about it. I think, "It's so rare that people's first relationships work out in the long run, there's no way I could be that lucky." 

Anything that you older, more experienced redditors could say that would help me to understand these feelings, or better, to convince me to not worry about a concern that I know deep down is so ridiculously trivial and unwarranted, would be greatly appreciated. Thanks in advance.
<bot>: I can't stop thinking about that fact that most first relationships don't work out, even though I know it shouldn't be a concern.