Hun if you have never had sex previously then your body will need time to adjust to having sex with a man and yes it can be uncomfortable my advice is to go slow and let your boyfriend know that it is uncomfortable for you and to slow down until your body becomes accustomed to him don't be shy to tell him what you need and please remember to be safe at all costs and use protection
bleeding during sex the first few times is normal some girls do and others do not I would not be overly concerned unless of course you have pain as well in which case try more lubricant a change of positions etc it could be your hymen was not torn through and also your body will take time to adjust to having sex and it will be uncomfortable for a time.