I'm a guy, but my wife & daughter are now both divers.
IMO it's OK to ask for help, but there are limits. Those vary depending on who you're asking.
Strength is not fixed in stone. You *can* handle a basic single tank scuba unit. You may need to start hitting the gym regularly to build up some strength, but on balance, being in better condition is generally better for diving any way. Wish my daughter (age 21) would take that more seriously, LOL
Diving, swimming with fins, uses muscles that you generally don't use. They tend to complain about it after wards, unless they're somewhat conditioned to it. When I haven't been in a while, my legs will let me know later. The more frequently I can go, the less I feel the impact as those muscles get used.
My daughter wears a bikini, she's rather tall & skinny. My wife wears a one piece, ore a pair of form fitting swim shorts with a lycra dive skin shirt. I wear form fitting swim shorts, as I don't like loose one bunching up under my suit. O'Neil, Henderson & others make such attire.