Does Allah turn away the prayers of those who make mistakes?

Assalamu alaikum. For the second year straight, I found out I didn't get accepted into the university program I really wanted. I've been making so much dua over the last few months, and after the first rejection, it actually brought me closer to my deen and I left some sins behind. But these past few days after Ramadan, I felt my iman dipping a bit, and I slipped back into a couple of old habits. Then today, the rejection came again. It makes me wonder if it's because of my slip-ups-I thought I wouldn't hear back until mid-April, but it came now, right after those mistakes, even though I prayed so hard for an offer. I don't see the point in trying a third year; I've done everything I possibly could. It hurts a lot, and while everyone says it's probably for the best, nothing else interests me like this program, and it's the only one in the country. I could've sworn things were going smoothly, and my heart felt like Allah denied me the first time to draw me closer, so I'd get in this time. Now I feel like making dua is pointless because I'll never truly have tawakkul, and I'm stuck heading into some other course I won't like. I tried so hard, but it didn't work out, and thinking about it all makes me feel worse, knowing Allah says He is as His servant thinks of Him. Looking ahead, I just feel like I'll be depressed forever, and I can't even keep my connection with Allah strong. It's like I'm trapped, unable to trust properly or pray sincerely. Sorry if this is all over the place.