This has actually been making me feel guilty for a while. I was on the bus (city transit) with some friends and the vibration was definitely making me excited. I kept positioning myself so that I would get maximum effect from the vibration. I feel guilty because I was doing this in public, but I don't think my friends or anyone else noticed. Is it bad that I was being turned on by the bus? Is it bad that I was getting so excited in general in a public place?

I guess if you enjoyed it ...why not? What harm?
Many girls do the same on motorcycles. Sometimes you just can't avoid vibration...like at a concert...so why not let it happen?

Maggie,

What is there to feel guilty for? If the bus was hot and there was a cool breeze and you positioned yourself to feel the cool breeze would that be wrong? If the bus was cold and there was a heater and you sat where you could get the benefit of the most amount of heat- would that be bad? We all need to take advantage of opportunities that we encounter- and as long as no one else is hurt when we take advantage of such opportunities - than just go for it!!!

Maggie...It is easy for me, Gregorio, to say, "Do not feel guilty." But, after thinking it over and putting myself in your shoes, my feeling is: if you continue to feel guilty after feeling those vibrations, me telling you not to probably isn't going to work.... and if this is the case, you might take steps to avoid those particular vibrations.
Many people feel guilty/ uncomfortable after masturbation (self pleasuring) and it is hard to change that....it can be a normal, inner-personal reaction... it is the way many of us are and there is nothing wrong with that...it is the way we are made.
However, enjoying fulfilling sexual pleasure is best at the right time, place and for the right reasons....the ones that feel right for each individual person.
Respectfully,
Gregorio