"We were together, I forget the rest." - Walt Whitman
There is nothing wrong with spending time alone. In fact, I recommend you take time to spend with just yourself. But it's natural to crave companionship. We are humans, after all.
Momentum, resilience, and enthusiasm are the foundations of companionship. It's good to have someone with common interests cheering you on and pushing you to succeed-momentum. You have a support system, so you're more likely to recover from setbacks-resilience. You're excited about the things going on in your life because you have someone to share them with-enthusiasm. It's wonderful to have people to share things with. It’s amazing to care for someone and be cared for. Spend as much time as you can doing the things that make you happy with the people that make you happy.
P.S. Companionships are wonderful, but remember to never lose yourself in someone else.