Long question about Computers

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Hi /g/.
I have a question and hope you will help me.
Since childhood, I often heard on the radio an ad for some academy that taught stuff such as: C++, SQL, Java, PHP, Networking, etc. I decided with all my heart to learn them. But, since I was poor kid from Africa,I couldn't. When I graduated from high school, top of my class, I got a scholarship for an MBBS. I couldn't say no. But, I was wondering if I could learn all those stuff online, on my own; or do I have to seek a formal education, i.e uni or an academy to learn.
If I could teach my self online, where do I start?
I've already taken MS-DOS, Access, Excel, PP and Visual Basic.
Thank you.