18 year old, no idea if im balding or born with this hairline

[hairstuff]

turned 18 not long ago and never really paid attention to my hairline properly until recently. i noticed that i had this hairline since i was 15 but never really thought much about it. i never cared about how my hair looked and always had a fringe when i was younger than 15 so i dont really know if i was born with this hairline and i cant go back and look through photos to find my old hairline either(my fringe was always covering it). younger pictures of me (when i was 2 and below when my hair was shorter) showed an M shaped hairline too so could this just be my natural hairline? tbh i never remembered having a "normal" hairline. thickness is the same throughout apart from a few baby hairs and i never noticed any excessive hair shedding nor did my scalp ever itched and ever had a problem with dandruff until my recent(and first ever) hair perm so im just confused if my hairline is one that is receding or is it just natural for me. pictures taken days apart if anyone is wondering