Dear Zamba, congratulations on your acceptance to medical school! This is an impressive feat for anyone but even more so for someone applying their 3rd cycle as an international student, so take a moment to be proud of yourself.
I can relate to what you're feeling. When I was accepted to med school I was a 31yo reapplicant, and I was leaving behind a career that was just starting to go well and where I was at the end of the training path instead of the beginning. Definitely had some people tell me I was crazy to give up what I had for the life of a medical trainee and/or say I was too old, but remember the former is a personal decision and the latter is just not true. My first year of med school was the hardest for me, not because of the academic work (though there is a lot to learn) but because of questioning myself/ my decision constantly. I got into a bad habit of rubbing my eyes a lot from stress, and for the first time in my life had like 3 styes in a 6 month period (this does wonders for your self confidence too, lol).
My only advice would be if you're gonna commit to medicine, commit to medicine. Don't double guess yourself and keep wondering "what if?". You earned this and nobody but you will know or care about your age. At least for me each year I got closer to my goal has been happier. I came into med school married, but plenty of people aren't and still find time to date/ meet partners. I did experience a pregnancy loss during medical school, but have had friends outside medicine go through the same thing. I am lucky that all the things that made me a unique applicant to medical school have helped me be highly sought for residency and I feel like I have my pick of good programs. I'll be going into intern year pregnant, and while this isn't "ideal" I know that having a family is important to me and I will make it work. Good luck!