Thanks for posting your query.
I can understand your concern for the bladder lump. The few causes of such a lump in bladder are schistosomiasis, interstitial cystitis, chronic cystitis, tuberculosis and of course bladder cancer. Interstitial cystitis is very common in young women and may present with Pain in your pelvis (suprapubic) or between the vagina and anus or persistent, urgent need to urinate.
You have got the biopsy done but have you got the results? The gold standard for diagnosing bladder cancer is biopsy obtained during cystoscopy. If the biopsy report has come as normal then there is nothing to worry.
Hope that this information helps and hope that you will get better soon.
Wishing you good health.