BAH! Don't listen to those telling you sex isn't what it is hyped up to be. Mechanical lacking passion sex is better not happening at all, because it isn't even in the same ballpark with actual passionate sex. However, you didn't have actual passionate sex, you didn't stop her, but you were not actively participating by any means. No, there really isn't anything to feel guilty about, instead you learned something important, you don't want to have sex with people you are not really interested in, which is a GREAT thing. People who settle for " anyone willing" have no idea what they are missing out on. You just have to gain the backbone to separate yourself before the act next time, which considering this was your first time in a sexual experience, it is common to not know how to react.
Actual passionate sex is when there is no question about your participation because you are so involved in the act you can break things around you and not even realize it until afterwards. LOL When you have these passion feelings for someone you are so excited about someone that you can climax just thinking about them, uncontrollably at times. No, not everyone ever finds someone that " does it for them" but many of us do. Not all sex is lacking passion, and if you don't want mechanical bland sex, you are better waiting until someone makes you feel that level of passion than just having sex with someone because they are willing. Waiting until your sure, and they share the same feelings for you as you have for them is so much better than jumping the gun and attempting to "find out" during.
Now, I am female, however, this isn't just limited to male or female. Mechanical, lacking passion sex is lame no matter who you are. "Going through the motions" isn't worth the regret.