I’m the only single one in my friend group

I’m (19m) and I’m extremely confused on how all 6 of my friends seemingly had no issue finding relationships and get into multiple talking stages with women meanwhile I haven’t even been complimented or even approached by a girl in 3 years I workout 3 days a week and watch my weight my friends tell me I’m not ugly but I’m starting to not believe them because its always the non single people saying it’ll happen eventually or give the same stupid advice when it simply hasn’t been working clearly. So I just don’t know what I’m doing wrong and its getting harder and harder to not just give up on any sort of love