Bettering myself for the future

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I'm 18 and going into my final year of high school. I'm #1 in my class and am on track to be accepted into Ohio State University. I have no problems in taking challenging classes and studying, but I do have other problems that could hold me back for my future. I've had social anxiety, general anxiety, and depression for a long time. Going into my senior year (then college), I'll be required to give speeches and make meaningful connections with other people, along with a great deal of other things that require me to be socially capable. Right now I feel like my social anxiety and depression feed off of each other and create a never ending cycle of problems. For example, since I have no one to talk to I'll sometimes reach out to someone and fail and that makes me more depressed, which makes me less likely to myself out there in the future. I'm just looking for advice on how to escape these never ending problems. Dealing with these issues my whole life, I've tried just about everything and nothing seems to work.