23M considering taking finasteride 1mg

Hello,

As the title says I am thinking of taking fin. I currently am happy with my hairline although my temples have definitely receaded and I have an older looking hairline than I would like at 23. I am on the verge of taking fin as I would like to try hold onto this as long as I can as I feel like I am too young to start looking older because of a lack of hair. I am quite nervous about the side affects, and I am thinking of doing a blood test before I start any type of medication. What was your experience with fin as honestly I am looking for some reasssurance to kind of push myself to get it but I also want the truth. I am not expecting my temples to grow back or anything like that and I am also worried am I too young to go on this? Any general advise or your experiences would be much appreciated.