Challenge in winter

Recently feeling sucks...Sydney's weather become cooler and cooler...I don't know is my problem become weaker or the weather become abnormal.I just feel this winter is colder than previous years.But the question is,is it only ME to feel that???When I walking outside,I just saw many people wear NOT so THICK clothes.They just let me feel that actually the weather not so chill as I think.But why I still feel shaking when I walking outside???!!!!I almost confirm that my illness caused by the bad weather here.I really feel my heart not so good condition these few days and harder to breathe.I don't want myself get weaker,I also don't want to let others worry about me...What I can do?!Just hide all the hardest by myself lo.....I think in this winter,I need to challenge that see how I can handle this sucks weather lo~~~~