<human>: Give me the gist of the text in a nutshell

About a year ago (when I was 21), I found the most sincere, sweet, kind girl I had ever met. 

I was a huge partier before then, a very independent person who had just graduated uni the year before. I had no intention of becoming serious-I was planning on going to grad school in two years (what is now next year) but slowly I fell for this girl and stopped being a bachelor. I asked her out-and after about 6 months of being in denial that I was actually in a relationship I began to really think about my future with this girl.

She is extremely attractive, loyal, funny-and we share the same interests. But my constant self-doubt is destroying the relationship. I love spending time with her, and have grown to not miss the bachelor life (I used to heavily when we first started dating), but a part of me still thinks this is crazy and wrong. 

I'll be moving back to Canada next year, and because my gf is conservative she wants some commitment if she were to move with me (won't do long distance and I don't want that). 

Its hard for me to imagine committing right now. I may not miss being young now, but when I think about permanently losing my youth it scares me. When I think about settling down, it makes me so happy thinking about how happy my gf will be and how awesome a wife she will be-but I can't see myself being that happy settling down that young. Not sad-but not estatic. I also feel so depressed thinking of losing her in my life because she has honestly cared for me like no one in this world has. I also feel that by giving up the "chase" of other girls, I've lost a bit of passion, spark, and drive in my life. Lots of feels I know.

I want to make a decision now-because the idea of having her waiting another year and then destroying this girl is terrifying. I want the best for her-and if I can't commit I don't want to waste a second of her time. How do I know if I'm overthinking this or if I'm really not read?
<bot>: never thought I'd get this serious so young-now entertaining idea of getting engaged by next year (at 24). Right girl but too young?