Use the Scale Technique
Johnny Groove, people can tell you to follow your dreams and they are right...most of the time. Sometimes as humans we have to look at reality and look at other opportunities. If you believe 100% that you can become a tennis pro, regardless of injuries, then go for it man. More power to you. But if you put, other opportunities on the scale vs. tennis and find the other opportunities are more worthwhile then follow those.
If you find tennis isn't right for you then look at what else you love in life: Writing, Talking to others, managing numbers, whatever and try to pursue those.
Also if Tennis Pro fails, you can always look at other careers in tennis
. Aka Writing for a Tennis newspaper with analysis etc. (If you are persistent enough you could get a job in such a field). Tennis coach/teacher at a club. Any ATP 5000 player could get this job pretty easy. Linesman. Working at a tennis shop. The possibilities are endless! Plus you don't have to lose your passion for tennis!
Ah, mate, I appreciate your opinion. Your thoughts are well thought out and lucid, helpful, and said in a friendly, agreeable tone.
And the thing is, I can't settle for that. If I am going to be in tennis, I need to be the greatest. I cannot be happy being a linesperson, I cannot be happy being the guy giving lessons to 40 year old housewives. I've worked at more than one tennis shop, I can't just sit there and watch people play all day while I'm there lusting for the game in the pro shop. I cannot be happy not being the best. When I am among tennis folk, when I am discussing, I feel as though they don't respect my opinion because they've coached this guy and that guy and this other guy used to train with so and so and I haven't. When this happens, and it does often, the feeling I get when confronted with this, a fire explodes in my eyes and passion runs through my blood to prove them wrong.
Nothing else in life gives me this same rush, and trust me, I've looked around.
Millions of guys have called it quits cause of injury, but I won't, and I can't. I've tried it even, come up with every excuse, but I couldn't live with myself, couldn't look at myself in the mirror knowing that I could still play and not giving it a shot.