Don’t compare to the number of groomsmen, nobody will care about that. Only have people as your bridesmaids if you genuinely want them to be part of your special day, to be getting ready with you in the morning, to be helping organise your hen do, to be in all the photos. They have a job to do and you have to be able to rely on them to make your day as stress free as possible.
My wedding was smaller than yours (60) - DH had no groomsmen (not even a best man) and I had 1 MOH, 2 bridesmaids and 1 flower girl (my niece, MOH’s daughter).
Research the costs involved - if you want more people, think about whether you can afford to have them all looking the same. Factor in the cost of dresses, shoes, hair, make up etc. For mine, I paid for dresses and hair, and they got their own shoes and did their own makeup (me paying for their makeup would have been another £50 each).
So, ultimately it’s up to you, but be sensible.