Many of the pro's do come come from a good 'gene pool'... certainly takes certain sorts to ride a bike, and be able to suffer.
I started at 16, from just riding paper rounds. Could keep up with the good lads on club runs, but waited till I was about 17-18 until I started racing. Did OK.... finished top 25 in most 120 field TT's... tried a few road races, but mainly TT'ed..... couldn't have afforded to fix my best bike if I crashed it on road races though...no rich parents - it was all my money......so still have my 'best bike'.....
I've raced against Chris Boardman and Graham Obree (needless to say they both battered the whole field).... but our club got Best 'non-sponsored' club at a hill climb - Manc. Wheelers with Chris won it for them, but he said "well done lads"...... all about competing !!!
Support is the key, especially if you are not from cycling family, like me....so club mates...share race travel costs etc, have a go, get involved....take advise....
What's happened is though, although not originally a 'family inherited thing' my son is naturally into cycling, he's pretty nippy for his size, and totally at home on his bike...I can see him racing at some point.....
Keep at it, try racing, maybe get spotted..... there are a few Olympian cyclists that weren't from cycling families.......good luck, train hard, listen to advise....