<human>: Can you provide a brief rundown of the text in within 3 sentences?

This situation has happened to me before. I was quite lonely as a college freshman and got back together with my high school flame (at the time a HS junior).

However this relationship was predicated on my loneliness and when I didn't feel lonely I didn't care about her much at all. After a short second honeymoon we broke up again.

Now, after not dating for years and only having one drunken makeout in the meantime, I'm hooking up with a girl I met on tinder (F, 20, three dates over twelve days). I lost my v-card to her last week and we have pleasant conversation/physics. This leads me to think I like her, but there are some problems present. 

Other than having relatively similar musical tastes and senses of humor, we don't really have much in common. 

She's an art student while I'm engineering.

She's indoorsy while I'm outdoorsy.

She doesn't like physical activity while I'm rabid. 

I'm worried that after the honeymoon inevitably dries up we won't have anything to bond over and I won't really like her because I only connected with her out of loneliness. We aren't declared exclusive yet, but things seem to be headed in that direction with multiple long dates planned for the future. 

Are my concerns well founded? After we learn all about each other I don't know if we'll have much to talk about or do together. To maintain the relationship will we have to find/create substantial common interests?

I don't get a lot of girls so it's hard to accept that I just need to "find another fish." I want to make this work if possible.
<bot>: Lonely guy not sure if he really likes girl he's hooking up with or just relieving loneliness. Not many common intrests.