If you're worried, go to your GP. Assuming you're a UK/EU national in the UK, your healthcare will be free.
Also bear in mind that some smells are completely normal - apparently sometimes other people can't smell them either, but I think a lot of people are self-conscious about smells from *down there* (I know I am, especially when I'm on my period)
But all in all I'd recommend going to your GP, especially if there are bumps and itchy. Or in some places there are drop-in sexual health clinics which might be useful too (also free if the above applies).