HeavyGuy

As the topic title reads, I am not able to enter vehicles as a passenger. I am when I first start up MTA, I play one server, it works fine. I then reconnected, and then it happened. I went to get in a car with someone and I simply couldn't. So I checked my settings, they were mapped out to Enter and F for entering vehicles, and I was pressing these buttons, yet nothing happened. My character stood around without a care in the world. I then watched as 2 other people entered the vehicle without a problem, so I was pretty frustrated, and only saw one other person have this problem. Does anyone have any idea what is causing this and why it's happening?