Just wondering if tight pelvic floor muscles might be cause of my symptoms (frequent need to urinate, premature ejaculation, peeing sensation etc?

Pelvic floor. There are physical therapies for the pelvic floor to treat pelvic pain and prostatitis.
Get evaluation. There can be many causes. I'm concerned about the frequent need to urinate and the possibility that you can have a urinary tract infection or another medical problem. Please see your primary care doctor who can evaluate you and recommend next steps. Hope this answer helps.