If you are a straight girl, or a bisexual one, the first time you have sex CAN cause bleeding or pain. It is usually only a few small spots of blood, though some girls need to wear a pad for a few hours afterwards. If the bleeding is particularly heavy or long-lasting, something isn't right and they should consult a doctor.
The actual feelings of your first time can range from uncomfortable to quite painful. This is determined by how aroused you are, how you emotionally feel about the situation, and whether your vagina has had anything in it in the past.
There is no way for anyone to predict how much bleeding or pain a girl will experience when she has intercourse - but it's worth noting that it's not bad enough to make most people stop having an interest in sex!
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