I can’t comment on engineering but as a medical professional I can say that the medical path is long and hard. If you have doubts now , it probably isn’t for you. When people ask me if they should be a doctor I always say that if you are passionate about medicine and can’t imagine doing anything other than being a doctor then go for it. Otherwise don’t do it. Definitely don’t do it because it sounds like a good course, is hard to get into, for the money, for the prestige, for the lifestyle etc etc.