Indeed. Bear in mind that in 5e, Strength is about natural athleticism and ability to generate power, not about sheer size. Bruce Lee is probably the archetypal example of a high-strength, high-dex character and one example of a low-strength character would be out-of-condition, perhaps a bit of a couch potato, rather than just being small.It's hard to separate a lot of these activities.
I'm not a super-strong guy but I teach rock-climbing. There are football players way stronger than me, who could break me in two but can't pull themselves up on to the rock or do 1 finger chin-ups. But I wouldn't say I have proficiency in acrobatics. Maybe I'm low strength and high proficiency. It's all about muscle to weight ratio. Most gymnasts are built light and strong.
That kind of thing is not taken in to consideration in D&D except in backgrounds and flaws and general descriptions.
Just because you're not huge and hulking, I wouldn't put you down as low-strength. Sounds like you have an impressive power-to-weight ratio which would translate to above-average Strength in 5e.
(That and D&D isn't granular enough to distinguish between different brands of athletic pursuit. )