<human>: Can you succinctly summarize the text in 1-3 sentences?

As a foreword I should say that I wanted to stray from buying the bike on craigslist altogether. Amazon has some [really cheap bikes] that would've easily met my needs. 

So my FU begins by listening to my dad who INSISTED I find a bike on craigslist instead of buying new or at a bike sale. He attested to the quality of the bikes he's bought (then again he lives in a pretty nice area), and told me to do the same.

So I live in DC and metro'd about 40 minutes to get to this guy's "house". Keep in mind that 20% of DC is [below the poverty line] I show up and
1. It's not a house at all.
2. It's a motel, and there's practically a gang war going on outside.
3. I'm the only white person (of about 20 that were standing around outside the motel)

Here's where I fucked up: instead of leaving right then, I decided to call the guy who had the ad on craigslist. One of the guys hanging around comes over and says, "you the guy who called about the bike?" I confirmed and he asked that I follow him.

Without realizing we were entering the hotel, he walks me over to the doors and grabs the METAL CHAIN he was using as a leash for his PITBULL who was I guess necessary to bring along. At this point I'm slightly freaked out but I paid a fair amount to get here in both time and money.

So we take the stairs (instead of the elevator for whatever reason, there was one) to the fifth floor where we enter his room, and he introduces me to his 250lb "brother" who is standing next to a bike that is nothing like the one in the ad. After a quick scan of the room, I notice a handgun on the dresser. Adrenaline kicks in, dog is snarling, bother is also eyeing the gun on the dresser, bike seller picks up the bike and hands it to me, no trial period on that bad boy.

In a heartbeat I give him the cash and book it. basically rode the bike sized for a 12yo down the stairs. Haven't stopped thinking about how I fucked up since.
<bot>: got muscled into buying a 1/2 size bike by two black guys, a handgun, and a pitbull at a motel.