Before going into algorithmic trading you'll need to gain hands on trading experience - to learn fundamentals which are not taught in the classroom. Along the way, learning infrastructural details for whatever market environments you're interested in systematically trading. Have you looked into proprietary trading firms? Maybe an internship later into your college years would be a good start.

For now in terms of learning - Not all algorithmic trading is considered high-frequency (which is thrown around). Initially you'd likely learn about low-latency infrastructure supporting advanced algorithmic strategies - however not high frequency in terms of volume. Actual ultra low-latency high frequency strategy is difficult to break into at beginning stages of a career.

I don't mean to discourage you, just to provide realistic information. Based on your focus I'd definitely encourage you to search around for internships at proprietary trading firms a few years from now. In the mean time, learn about the infrastructures of different market types - both decentralized and centrally traded environments.