Hg,
Your dilema kinda reminds me of what I was thinking about a while back. This is no simple decision and takes much forethought.
I am crazy about cars/automechanics (more than I let on) and really wanted to take classes in univesity, but just wasn't able to with all the Chemistry stuff I had to do. I kinda know how you feel b/c I LOVE chemistry, but I also LOVE musclecars/automechanics. Many times I thought about just quitting the chemistry field and getting a degree in mechanical engineering or simply just go work for the Ford dealer so I could be closer to the car stuff. For me it was all about the cars and QUICK pleasure. I knew that would not be a good decision.
Although our situations are not exactly the same, you asked for advice and I will give mine:
1) Listen to your teacher and your family and most definately go into Physics. Yes, you may have to put your die hard automechanics hobby on hold, but in the end it will be worth it. Not only will you have more than the required funds to fuel your fire, but you will also have a powerful degree AND it will be something you like.
2) If you had said you just wanted the Physics degree for the money than I'd say screw it and not waste time with it. Life is too short to waste time. But you said you like Astrophysics and I think that degree would be priceless to you in the future. Ultimately it is your decision and it should be something YOU want.
3) You said you really enjoyed both, well, simply put, I can see one easily doing automechanics with an astrophysics degree, but it's a little more difficult to see one doing astrophysics (with intention of a major find/discovery) working at a Ford dealership.
Set yourself up right, man. It's more about making a good and comfortable future than having it all now/immediately (you instant gratification).
GET THAT PHYSICS DEGREE!!!!
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'79 Mustang Coup w/ 4" Cowl
Stock 5.8L, C4 w/ shift kit
Holley 750 cfm, Edelbrock Performer RPM intake
1 5/8" MAC shorty headers, Al driveshaft
2.5" Off road H-pipe, 2-chamber Flowmasters
Front: 225/60/15, Rear: 255/60/15 Eagle GT II
Weld wheels (15x6;15x8), 8.8" Rear w/ 3.55s
14 x 4” K&N air filter (getting the Xtreme setup soon)
"Red, thou art my companion. Hasten now your quickened metamorphosis to Green that I may conquer all who dare abide there beside me. May they be left thither behind burnt black." ---Fox Body