I feel for the idea that acoustic will get your technique better in the short term and such, however... I think the real question is what’s going to make you keep at it long term. Can you play “Sunshine of your love” on an acoustic? Sure. Is it what a 14 year old wants to do? No. If it doesn’t excite you, you’ll probably quit. Also, the transition from electric to acoustic is much easier than people make it out to be IMO.