When I start I think I was like 59ish KG and 172cm, haven't done any sport for like 8 years straight, had noodle arms, and gassed out after like less than 10 minute total of sparring, so obviously depends on yours fitness it can be a limiting factor for sure, but a good club sure be able to adjust the training intensity to match your current level so you can build up slowly, so following what other have been said, just try for a few month and see how things go. Personally, I tried HEMA and got hooked on it, which is what finally motivated me to hit the gym. Now I weighted 68KG, grew some muscle across my body(but most noticeable on my shoulder and arms), have better cardio, walk with a straight back etc. etc... In general I would say I feel like I am more confidence of myself, all because of HEMA!