Funny Childhood Memory

I don't remember how old I was to be exact, but I was I would say around 10 years old or so. I was traveling by bus with my mom in on a long journey to a neighboring city. Back then in the small town where we came from, there was were no taxis, so taking buses were was the primary means of traveling from a town to a city. To reach our destination, we had to transfer from bus to bus. Back then, the number of buses in service was very limited for a crowded population. Getting on and off the buses were was difficult, and finding a seat to sit down was difficult beyond reach. The trip was unpleasant for not only that because I had to be standing on my foot throughout the time I was on the buses, but I was short back then, and every direction that I looked, I was face to face with some an adult's butt (When you are [can also use the contraction you're] a kid, some an adult's butt is at your eye level). I bet similar experience also resonates in the memories of many people around the world.  That happens when you are a kid, taking a train or bus during rush hour.

I have re-written some of your sentences below the way I might write them:

When I was around 10 or so I traveled by bus with my Mom to a neighbouring city.  

The trip was unpleasent for two reasons. One, I had to stand the whole way and two, because everywhere I looked I was face to face with an adult's butt.

I bet people around the world have had similar experiences.