You're right that you should keep practicing engineering, but you can also deliberately practice your social skills: public speaking, networking, coordinating groups, recruiting, etc. I suggest volunteering for a local non-profit. You can help them with their software needs and also help recruit and lead volunteers. Taking responsibility in a small non-profit is much like running a start-up.

Both those things could be useful in the future, and probably not in the way you think.

I'm not advising you to go "play around" so to speak, but opening up and learning how to get people to like you would be an invaluable asset if you ever get involved in the startup scene.

Heck, I think it's useful in everyday life.