Is it unfilial if i were to do this?

Quick explanation, I'm training to become something what my dad wants. If everything goes according to my dad's plan I'll possibly be free to do my own thing when I'm 34 (possibly able to do the things I wanted to do on the side, but I'll be burdened with responsibilities).

If I fail to become the thing my dad want's me to become, I'm expecting him to make me train again for another year to try again. (And I definitely do not want to do it for another year again). the place where I train is like a boot camp, I can't do the shit wanted to do. not to mention if I get accepted I'll have a 4 year training that's much harder and more strict than my training right now.

Now the problem, I want to say to my dad that if I fail this time, I'm not doing this again. I said I will do my best but If I fail that's it.

There's another thing that my dad wants me to do, but it's got way more freedom.(This'll be my main argument I'm gonna use to evade another year of training).

You need to know, that these things that my dad wants me to do is for my own good in my dad's eyes. But I have things i want to become.

My thoughts are, if I get accepted, I'll sacrifice my time for my dad, because that's what he did for me since I was little.

I'll be honest, I don't have a single confidence that I'm gonna get accepted. thousands of other people are aiming for this thing as I am. so that's that.

My dad has sacrificed himself to raise me since I was a kid, But damn! I don't want to waste 14 years of my life doing something I don't want to, for all I know in that 14 years I'll be at a successful point of my carrier doing the thing I wanted.

so the sacrifices:
1. get accepted, 14 years of my life
2. About 5 years. ( I'll take this rather than the other one ).

Is it unfilial for me to not sacrifice myself for my dad, when he sacrificed himself for me?

Tl;Dr

Refusing to sacrifice my time for my dad when he sacrificed his time and effort for me.

Keep in mind my dad has all the best wishes for me, he just doesn't understand the thing I wanted to do.

Sorry if all this doesn't make any sense.