Sound Recordings

I have been gathering my sound recordings, but listening back to them, the sounds are not obvious noises for example I recorded several moving trains but all of them sound like aeroplanes, I feel by including sounds like these is going to ruin the piece and makes it sound messy, therefore for sounds that I am unable to gather I will source them from the internet, this is not ideal because I wanted all the sounds to be my own but I will still be recording all my own dialogue and sounds where I can.