need ur advice ladies

What is the best position to have sex for the first time? We tried him on top but it was awkward and wouldn't go in just like less than half of the penis.. is this normal? I also tried to be on top but I would jump off once it goes in a bit and starts to hurt (it's kind of this burning feeling but not like infection burn but like something entering u burn idk if that makes sense or is Normal) please ladies I need ur advice xx