Am I making the right choice?

So I've decided to take a year out after this year is over, and then go back to University for second year. This has been something I wanted to do since first semester, as I was never really happy at my university (small place with little option of work/field experience/internships and never really fit in here). I haven't made any 'close' life-long friends, just course mates who I hang out with, but they've all got their own friends too who they're super close with.

The thing is, I'm starting to panic that I made the wrong choice. I wanted to leave because I was genuinely unhappy here, but now I've just finished my last exam I'm scared that when I return for second year, everyone (who will be 3rd years then) wouldn't even give a damn about me anymore, and I'll be even more alone than I was previously.

Is it just that nostalgia effect where everything seems so much better when you're about to lose it? Or am I just feeling the brunt of a bad choice?