Still can't understand?

Hi. I got placed in a very good company through my college placement as an intern. Due to large team size they didn't converted me as a full time employee. But then I got call from another team and go through the interview process like technical rounds mangerial round and hr round. I got offer in that team. Initially they gave me recorded KTs and assigned me few courses regarding the product and I completed that. But the problem arises when I am implementing what I learned from KTs and courses. Not all time, but I reach out to people for some clarity nd then I solve the issue. Within a month i was assigned a task which requires assistance from another team which has only two people from india to assist here. So that task took more time than it usually takes for an experienced member. My Manager on one on one speak like reach out to people when you need help, but when I do he speak like why are you wasting whole team time. And I'm the only one who is at the entry level post and others are seniors and they didn't showed any intrest in training or assisting me. So I'm bit worried about asking our for help. But I do resolve customer side bugs not just trouble shooting also the code changes. As the day went of, one day he said like from day one it's a disappointment from you and I really didn't understand what he saw in me in my first day and in the follow up meeting he says like ur performance is not up to the mark. I'm so depressed by those words and waiting for them to terminate me. When I applied for a week leave for my family function he called me in the morning and said you are terminated. And the reason he told me was performance issues. And I really didn't understand that is this a genuine reason? Thoughts on this.....

PS: I got terminated a week back..