R u a serious guy?

Laz time, got hear classmate say about got a guy wanna chase her, but she rejected becoz she say he is not serious enough. Since then we like to use this sentece:" R u a serious man?" Haha. At first i think that i hv nothing good but i think at least i m a serious guy n one heart ( not flower heart ). But then, i receive a message from a junior n make me think of this issue properly.

"These few days wont be online often, Best wishes to u ' yi lu shun feng', Come back to see ur children when u r free, hope u can accomplish ur dream in the shortest time. Pls change ur non-serious attitude, n let us see ur matured side. But i think is very hard. Dun forget us when u r rich n rmb u still owed us one meal. Haha"

After reading this message, i really feel shocked. Y m i not serios? N this message is from a junior! M i so not matured? I wanna ask her but she had offline that time.

I m not upsad but juz wanna change myself. Hope u can tell me y u say me like this so that i can change.

I m oredi a looser, n dun hv any good thins inside me. Now that i hv found at least one good but again, denied by ppl. Haiz...

**** juz to inform that i asked her about this weeks later n it's juz a misunderstand, so ntg happen. ***