I did many times, esp when I wasn't busy and other friends were busy with the friends I didn't particularly like because of their "social activities" shall I say.
However, it wasn't the end of the world, because they would text me asking if I'd hang out and vice versa.
Uni doesn't have to be a lonely road, but it is hard to find friends that fit into your personality and lifestyle and vice vera. But friendship takes time to develop and that only comes with time.
If you have friends atm, but don't consider them as "true" friends, or "close" friends, then you need to change that. If they're not willing to message you or meet up and you think you're putting all the effort into it, then it's not a friendship as any relationship is a two-way thing.
If you're also in first year, it does get A LOT better!