Do I really need one?

Yes, no, maybe!

If you are selling your products or services to the English market, then you do not need to have your website translated. Anybody who does not speak English but comes across your website, can use google translate and if they really wanted your services, they’ll be in contact somehow.
Look at my website; my services are for English speakers, as I help with German tuition and translation, therefore my website is only in English. Any German speaker, who ...